C7800 Keeps Disconnecting and/or Very Slow

[NightHawkNancy]

Our C7800 Nighthawk cable modem router recently started disconnecting or getting VERY slow speeds out of the blue. We purchased it in April 2021 and it worked flawlessly up until the middle of last month. This happens while diriectly connect to the Nighthawk AND on WiFi from several different devices. I've done a factory reset, contacted the ISP (Wow! Internet) multiple times, rebooted, etc and have had no luck. Very frustrating. 

The Cable Connection info changes often. One time I only had one unlocked channel, I'll refresh the cable connections page and all of a sudden ALL of the downstream channels are not locked. The ISP keeps telling me it's a hardware issue and to contact Netgear. 

There's one splitter in the Coax cable and I don't have a power source where it comes into the house to directly attach the Nighthawk to it. 

Do any of you have suggestions?

Cable Connection

Apply             Cancel     Frequency start Value This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect. Starting Frequency

<tabindex=-1>Startup Procedure</tabindex=-1>

Procedure Status Comment Acquire Downstream Channel 747000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security ENABLED BPI+ IP Provisioning Mode Honor MDD IPv4 only

<tabindex=-1>Downstream Bonded Channels (Partial Service)</tabindex=-1>

Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectabables 1 Locked QAM256 31 747000000 Hz -3.0 dBmV 38.9 dB 0 0 2 Locked QAM256 1 561000000 Hz 0.6 dBmV 31.1 dB 11668599 687709 3 Locked QAM256 2 567000000 Hz 0.8 dBmV 42.5 dB 0 0 4 Locked QAM256 3 573000000 Hz 1.0 dBmV 42.7 dB 0 0 5 Locked QAM256 4 579000000 Hz 0.7 dBmV 42.4 dB 0 0 6 Locked QAM256 5 585000000 Hz 0.8 dBmV 42.5 dB 0 0 7 Locked QAM256 6 591000000 Hz 0.8 dBmV 42.5 dB 0 0 8 Locked QAM256 7 597000000 Hz 1.2 dBmV 42.5 dB 0 0 9 Locked QAM256 8 603000000 Hz 1.3 dBmV 42.5 dB 0 0 10 Locked QAM256 9 609000000 Hz 1.5 dBmV 42.6 dB 0 0 11 Locked QAM256 10 615000000 Hz 1.5 dBmV 41.3 dB 345 0 12 Locked QAM256 11 621000000 Hz 1.5 dBmV 34.6 dB 316728 281489 13 Locked QAM256 12 627000000 Hz 0.9 dBmV 31.4 dB 120293 40300 14 Locked QAM256 13 633000000 Hz 0.4 dBmV 41.6 dB 2345904 1268636 15 Locked QAM256 14 639000000 Hz 0.4 dBmV 41.9 dB 4594 0 16 Locked QAM256 15 645000000 Hz 0.5 dBmV 41.9 dB 0 0 17 Locked QAM256 16 651000000 Hz 0.7 dBmV 41.8 dB 0 0 18 Locked QAM256 17 657000000 Hz 0.8 dBmV 41.9 dB 0 0 19 Locked QAM256 18 663000000 Hz 0.8 dBmV 41.7 dB 0 0 20 Locked QAM256 19 669000000 Hz 0.6 dBmV 41.6 dB 0 0 21 Locked QAM256 20 681000000 Hz 0.3 dBmV 41.6 dB 0 0 22 Locked QAM256 21 687000000 Hz 0.1 dBmV 41.5 dB 0 0 23 Locked QAM256 22 693000000 Hz 0.0 dBmV 41.6 dB 0 0 24 Locked QAM256 23 699000000 Hz 0.0 dBmV 41.6 dB 0 0 25 Locked QAM256 24 705000000 Hz -0.3 dBmV 41.3 dB 0 0 26 Locked QAM256 25 711000000 Hz -0.8 dBmV 41.2 dB 0 0 27 Locked QAM256 26 717000000 Hz -1.1 dBmV 41.1 dB 0 0 28 Locked QAM256 27 723000000 Hz -1.5 dBmV 40.8 dB 0 0 29 Locked QAM256 28 729000000 Hz -1.7 dBmV 40.0 dB 0 0 30 Locked QAM256 29 735000000 Hz -1.8 dBmV 39.4 dB 0 0 31 Locked QAM256 30 741000000 Hz -2.3 dBmV 38.2 dB 0 0 32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 6 5120 Ksym/sec 24600000 Hz 47.5 dBmV 2 Locked ATDMA 5 2560 Ksym/sec 18000000 Hz 46.3 dBmV 3 Locked ATDMA 7 5120 Ksym/sec 31000000 Hz 48.8 dBmV 4 Locked ATDMA 8 5120 Ksym/sec 37400000 Hz 49.8 dBmV 5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV 6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV 8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV

<tabindex=-1>Downstream OFDM Channels</tabindex=-1>

Channel Channel ID Indicator Subcarrier Zero Frequency Active Subcarrier Number Range Total Codewords Uncorrectable Codewords 1 32 Non-Primary 428600000 Hz 1528 ~ 2567 794019 131402 2 0 Other 0 Hz 0 ~ 0 0 0

<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>

Channel UpstreamIsMuted Ranging Status Subcarrier Zero Frequency Active Subcarrier Number Range Symbols Per Frame Tx Power 1   Other 0 Hz 0 ~ 0 0 0 dBmV 2   Other 0 Hz 0 ~ 0 0 0 dBmV

Current System Time: Mon, Mar 07, 2022 15:47:40

EVENT LOG

Time	Priority	Description
2022-03-07, 11:29:46	Warning (5)	MDD message timeout;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-07, 11:24:03	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-07, 11:23:59	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Warning (5)	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv4
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-03-07, 11:20:49	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-03-06, 18:15:58	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-03-06, 17:47:07	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	DHCP FAILED - Discover sent, no offer received;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-03-05, 09:29:27	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

[plemans]

You have errors in the cable connections page plus your logs are indicating issues. 

Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, bad/old/cheap connectors, or corroded connections. Replace them if you do.
If you can, simply connect the modem right where the coax comes into the home. This prevents wiring in the home from being the issue. I know you said you don't have an outlet but grab an extension cord and try the connection. 

[NightHawkNancy]

Thanks for the reply @plemans ! I removed the splitter from the coax line and connected the Nighthawk directly to where coax comes into the house. Cable appears to be in good condition. WiFi dropped out multiple times since moving it. 

Below is the latest Cable Connection report and Event Logs. Does this appear to be a hardware issue or ISP issue?

Cable Connection

Frequency start Value   This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.   Starting Frequency
<tabindex=-1>Startup Procedure</tabindex=-1>
Procedure Status Comment Acquire Downstream Channel 747000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security ENABLED BPI+ IP Provisioning Mode Honor MDD IPv4 only
<tabindex=-1>Downstream Bonded Channels</tabindex=-1>
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectabables 1 Locked QAM256 31 747000000 Hz 7.3 dBmV 40.1 dB 278 116 2 Locked QAM256 1 561000000 Hz 9.5 dBmV 42.3 dB 0 0 3 Locked QAM256 2 567000000 Hz 9.9 dBmV 42.8 dB 0 0 4 Locked QAM256 3 573000000 Hz 10.5 dBmV 42.9 dB 0 0 5 Locked QAM256 4 579000000 Hz 10.7 dBmV 43.0 dB 0 0 6 Locked QAM256 5 585000000 Hz 11.1 dBmV 42.9 dB 0 0 7 Locked QAM256 6 591000000 Hz 11.4 dBmV 43.1 dB 0 0 8 Locked QAM256 7 597000000 Hz 11.7 dBmV 43.2 dB 0 0 9 Locked QAM256 8 603000000 Hz 11.4 dBmV 42.8 dB 0 0 10 Locked QAM256 9 609000000 Hz 10.8 dBmV 42.5 dB 0 0 11 Locked QAM256 10 615000000 Hz 10.4 dBmV 42.6 dB 0 0 12 Locked QAM256 11 621000000 Hz 10.3 dBmV 42.1 dB 0 0 13 Locked QAM256 12 627000000 Hz 10.2 dBmV 42.3 dB 0 0 14 Locked QAM256 13 633000000 Hz 10.0 dBmV 42.3 dB 0 0 15 Locked QAM256 14 639000000 Hz 10.3 dBmV 42.3 dB 0 0 16 Locked QAM256 15 645000000 Hz 10.6 dBmV 42.1 dB 0 0 17 Locked QAM256 16 651000000 Hz 10.9 dBmV 42.3 dB 0 0 18 Locked QAM256 17 657000000 Hz 11.3 dBmV 42.4 dB 0 0 19 Locked QAM256 18 663000000 Hz 11.5 dBmV 42.4 dB 0 0 20 Locked QAM256 19 669000000 Hz 11.2 dBmV 42.3 dB 0 0 21 Locked QAM256 20 681000000 Hz 10.5 dBmV 42.1 dB 0 0 22 Locked QAM256 21 687000000 Hz 10.1 dBmV 41.9 dB 0 0 23 Locked QAM256 22 693000000 Hz 9.7 dBmV 41.9 dB 12 0 24 Locked QAM256 23 699000000 Hz 9.6 dBmV 42.0 dB 11 0 25 Locked QAM256 24 705000000 Hz 9.4 dBmV 41.7 dB 9 0 26 Locked QAM256 25 711000000 Hz 9.4 dBmV 41.9 dB 54 0 27 Locked QAM256 26 717000000 Hz 9.4 dBmV 41.8 dB 50 0 28 Locked QAM256 27 723000000 Hz 9.6 dBmV 41.8 dB 65 30 29 Locked QAM256 28 729000000 Hz 9.5 dBmV 41.8 dB 112 46 30 Locked QAM256 29 735000000 Hz 9.1 dBmV 41.5 dB 108 96 31 Locked QAM256 30 741000000 Hz 8.3 dBmV 41.1 dB 149 75 32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 5 2560 Ksym/sec 18000000 Hz 39.5 dBmV 2 Locked ATDMA 7 5120 Ksym/sec 31000000 Hz 41.8 dBmV 3 Locked ATDMA 6 5120 Ksym/sec 24600000 Hz 40.8 dBmV 4 Locked ATDMA 8 5120 Ksym/sec 37400000 Hz 43.0 dBmV 5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV 6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV 8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0 dBmV
<tabindex=-1>Downstream OFDM Channels</tabindex=-1>
Channel Channel ID Indicator Subcarrier Zero Frequency Active Subcarrier Number Range Total Codewords Uncorrectable Codewords 1 32 Non-Primary 428600000 Hz 1528 ~ 2567 192437 525 2 0 Other 0 Hz 0 ~ 0 0 0
<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>
Channel UpstreamIsMuted Ranging Status Subcarrier Zero Frequency Active Subcarrier Number Range Symbols Per Frame Tx Power 1   Other 0 Hz 0 ~ 0 0 0 dBmV 2   Other 0 Hz 0 ~ 0 0 0 dBmV
Current System Time: Tue, Mar 08, 2022 16:40:42

EVENT LOG

Time Priority Description 2022-03-08, 12:26:25 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; 2022-03-08, 12:26:21 Notice (6) TLV-11 - unrecognized OID;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv4 Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 2022-03-08, 11:52:22 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) DHCP FAILED - Discover sent, no offer received;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 2022-03-07, 16:22:34 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 2022-03-07, 16:17:43 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; 2022-03-07, 16:17:43 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; 2022-03-07, 16:17:33 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; 2022-03-07, 16:17:28 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; 2022-03-07, 16:17:28 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; 2022-03-07, 14:05:56 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 2022-03-07, 13:52:38 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; 2022-03-07, 11:24:03 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1; Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; 2022-03-07, 11:20:49 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;

[NightHawkNancy]

@FURRYe38 any suggestions on my issue here?

[plemans]

You've still got some indications of line problems in the logs. And now your power is a touch high. 

Not sure what splitter you had in line but your power jumped significantly from removing the one you have. 

Try putting a decent quality double splitter back in line. Maybe a triple. 

Just make sure its a decent quality. the channels you had issues with (hz not just channel number) cleared up but now others have errors. 

Try that first. 

and once you do that, clear the logs out so we know that anything new on there is from after the change. Not sure if you're log has events from befor the change. 

If it doesn't help, the isp might need to check the line. 

[NightHawkNancy]

@plemans this is the only one I've got access to at the moment and was the one I had on originally.

Antronix CMC2004H 

Is there a different one you'd recommend using? 

I've got a MicroCenter nearby...

[plemans]

Just not quite a 7db one. You could get a double or triple and drop the power just a little bit less. 

And make sure its on there tight on both ends. From changing splitters, your power cleaned up a bit on some of your channels and got worse on others. 

So make sure its on there tight as well as check the end of the coax cable to make sure none of the foil or shield is hitting the copper wire. 

[NightHawkNancy]

Here's a look at the last few days with the new splitter. Internet has dropped on us a couple of times. Wish I knew more about these logs so I could tell what's going on. Any thoughts? @plemans 

CABLE CONNECTION

Starting Frequency

---

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	747000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	ENABLED	BPI+
IP Provisioning Mode	Honor MDD	IPv4 only

---

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectabables
1	Locked	QAM256	31	747000000 Hz	0.6 dBmV	38.8 dB	14386	2599
2	Locked	QAM256	1	561000000 Hz	3.6 dBmV	41.2 dB	824	0
3	Locked	QAM256	2	567000000 Hz	4.5 dBmV	42.1 dB	925	0
4	Locked	QAM256	3	573000000 Hz	4.8 dBmV	42.1 dB	681	0
5	Locked	QAM256	4	579000000 Hz	5.2 dBmV	42.3 dB	493	0
6	Locked	QAM256	5	585000000 Hz	6.4 dBmV	42.7 dB	270	0
7	Locked	QAM256	6	591000000 Hz	6.7 dBmV	42.6 dB	235	0
8	Locked	QAM256	7	597000000 Hz	6.2 dBmV	42.4 dB	262	62
9	Locked	QAM256	8	603000000 Hz	6.2 dBmV	42.5 dB	285	47
10	Locked	QAM256	9	609000000 Hz	5.3 dBmV	42.1 dB	241	0
11	Locked	QAM256	10	615000000 Hz	4.3 dBmV	41.5 dB	219	0
12	Locked	QAM256	11	621000000 Hz	5.0 dBmV	41.6 dB	161	0
13	Locked	QAM256	12	627000000 Hz	4.7 dBmV	41.8 dB	86	0
14	Locked	QAM256	13	633000000 Hz	4.2 dBmV	41.4 dB	52	0
15	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
16	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
17	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
18	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
19	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
20	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
21	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
22	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
23	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
24	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
25	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
26	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
27	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
28	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
29	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
30	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
31	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0
32	Not Locked	Unknown	0	0 Hz	0.0 dBmV	0.0 dB	0	0

---

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	7	5120 Ksym/sec	31000000 Hz	44.5 dBmV
2	Locked	ATDMA	5	2560 Ksym/sec	18000000 Hz	41.8 dBmV
3	Locked	ATDMA	6	5120 Ksym/sec	24600000 Hz	43.3 dBmV
4	Locked	ATDMA	8	5120 Ksym/sec	37400000 Hz	46.0 dBmV
5	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV
6	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV
7	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV
8	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0 dBmV

---

Downstream OFDM Channels

Channel	Channel ID	Indicator	Subcarrier Zero Frequency	Active Subcarrier Number Range	Total Codewords	Uncorrectable Codewords
1	32	Non-Primary	428600000 Hz	1528 ~ 2567	2480752	3337
2	0	Other	0 Hz	0 ~ 0	0	0

---

Upstream OFDMA Channels

Channel	UpstreamIsMuted	Ranging Status	Subcarrier Zero Frequency	Active Subcarrier Number Range	Symbols Per Frame	Tx Power
1		Other	0 Hz	0 ~ 0	0	0 dBmV
2		Other	0 Hz	0 ~ 0	0	0 dBmV

EVENT LOG

2022-03-14, 21:00:38	Notice (6)	DHCP Renew - lease parameters Time Protocol Servers modified;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-14, 21:00:38	Error (4)	DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-14, 13:27:46	Warning (5)	MDD message timeout;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-14, 07:19:22	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:30:41	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:30:41	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:29:52	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:29:31	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:29:31	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:28:43	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:28:30	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:28:30	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:28:04	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:28:04	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:28:04	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 21:26:56	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 14:01:21	Error (4)	DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-13, 13:26:38	Warning (5)	MDD message timeout;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:44:02	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:44:02	Warning (5)	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:43:56	Notice (6)	Honoring MDD; IP provisioning mode = IPv4
2022-03-12, 17:43:49	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:43:44	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:43:44	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:43:32	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:43:31	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:39:44	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:39:44	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:39:44	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:39:31	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;
2022-03-12, 17:39:30	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=9c:c9:eb:87:d9:b0;CMTS-MAC=00:01:5c:b7:10:91;CM-QOS=1.1;CM-VER=3.1;

[plemans]

You've got a lot of unlocked channels, errors in the line, and logs indicating line issues. 

If you've done what you can on your side, time for the ISP to try.