CM1000 No Internet

[Wjones9589]

Hello, over the past few weeks there have been multiple Xfinity internet outages and currently there is no outage but Xfinity is stating the problem is with my modem. I’m extremely suspicious due to the constant outages and I’ve never had any problems previously. I have tried to attach the even log if that helps?

[Wjones9589]

Is there a different way to attach the event log? Photo file is too large and can’t upload from my PC due to no internet.

[FURRYe38]

Please post a copy and paste of the modems connection status page.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
Be sure your using good quality RG6 coax cable up to the modem. 
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Mod...
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router?article=24311
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html

Just copy and paste the text portions from the event and Connection status pages here in the post box. Will look similar to this:

https://community.netgear.com/t5/Cable-Modems-Routers/CM1200-Modem-Drops-In-amp-Out-amp-Slows-Down-S...

[Wjones9589]

This is the only way I can get it to paste since it’s from my phone.

2022-04-11, 17:10:20 Notice (6) CM-STATUS message sent. Event Type Code: 1; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=28:80:88:ac:dd:d0;CMTS-MAC=00:01:5c:b2:1a:61;CM-QOS=1.1;CM-VER=3.1;
2022-04-11, 17:10:16 Warning (5) MDD message timeout;CM-MAC=28:80:88:ac:dd:d0;CMTS-MAC=00:01:5c:b2:1a:61;CM-QOS=1.1;CM-VER=3.1;
2022-04-11, 17:09:59 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:ac:dd:d0;CMTS-MAC=00:01:5c:b2:1a:61;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=28:80:88:ac:dd:d0;CMTS-MAC=00:01:5c:b2:1a:61;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=28:80:88:ac:dd:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
2022-04-11, 16:23:27 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=28:80:88:ac:dd:d0;CMTS-MAC=00:01:5c:b2:1a:61;CM-QOS=1.1;CM-VER=3.1;
2022-04-11, 16:23:17 Critical (3) SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=28:80:88:ac:dd:d0;CMTS-MAC=00:01:5c:b2:1a:61;CM-QOS=1.1;CM-VER=3.1;
Time Not Established Critical (3) No Ranging Response received - T3 time-out;CM-MAC=28:80:88:ac:dd:d0;CMTS-MAC=00:01:5c:b2:1a:61;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=28:80:88:ac:dd:d0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

[FURRYe38]

Need the cable connection status page as well. 

You have criticals on the events page. Something your ISP needs to look into. 

[plemans]

Try borrowing a laptop/pc/table. 

The full event logs and the cable connections page allow us to better check your connection to give you hints/tips that might help. 

You can use screensnip in windows so we can get a decent view of it. 

[Wjones9589]

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
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 399000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enable BPI+
IP Provisioning Mode Honor MDD IPv6 only
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords
1 Locked QAM256 42 399000000 Hz -2.5 dBmV 42.2 dB 439060132 64 0
2 Locked QAM256 1 471000000 Hz -2.3 dBmV 42.0 dB 433351491 57 0
3 Locked QAM256 2 477000000 Hz -1.8 dBmV 42.4 dB 740359858 1269 1507
4 Locked QAM256 3 483000000 Hz -1.8 dBmV 42.2 dB 740159151 1497 1414
5 Locked QAM256 4 489000000 Hz -1.6 dBmV 42.3 dB 740205657 1111 1360
6 Locked QAM256 5 495000000 Hz -1.7 dBmV 42.5 dB 740232411 1129 1847
7 Locked QAM256 6 507000000 Hz -1.2 dBmV 42.7 dB 740329824 1196 1724
8 Locked QAM256 7 513000000 Hz -0.7 dBmV 43.1 dB 740341506 2339 8694
9 Locked QAM256 8 519000000 Hz -1.0 dBmV 42.9 dB 740346799 2308 8327
10 Locked QAM256 9 525000000 Hz -1.0 dBmV 42.9 dB 740364072 3100 8856
11 Locked QAM256 10 531000000 Hz -1.3 dBmV 42.7 dB 740372376 2726 8933
12 Locked QAM256 11 537000000 Hz -1.5 dBmV 42.8 dB 740383390 3802 9365
13 Locked QAM256 12 543000000 Hz -2.1 dBmV 42.6 dB 740392775 2814 10365
14 Locked QAM256 13 549000000 Hz -2.4 dBmV 42.5 dB 740401677 2763 9243
15 Locked QAM256 14 555000000 Hz -2.3 dBmV 42.1 dB 740410979 2283 8491
16 Locked QAM256 15 561000000 Hz -1.9 dBmV 42.1 dB 740421945 2392 7996
17 Locked QAM256 16 567000000 Hz -2.3 dBmV 42.3 dB 740429529 2173 8256
18 Locked QAM256 17 573000000 Hz -2.4 dBmV 42.3 dB 740440307 2842 8607
19 Locked QAM256 18 579000000 Hz -2.1 dBmV 42.3 dB 740450345 2888 9812
20 Locked QAM256 19 585000000 Hz -2.0 dBmV 42.3 dB 740455366 4656 8266
21 Locked QAM256 33 447000000 Hz -3.5 dBmV 41.3 dB 740464439 2011 2555
22 Locked QAM256 34 453000000 Hz -3.4 dBmV 41.5 dB 740480615 1876 2298
23 Locked QAM256 35 459000000 Hz -3.3 dBmV 41.5 dB 740478662 1825 2004
24 Locked QAM256 36 465000000 Hz -2.6 dBmV 41.9 dB 740455203 1573 1606
25 Locked QAM256 38 423000000 Hz -3.0 dBmV 41.7 dB 740393187 2178 3040
26 Locked QAM256 39 429000000 Hz -3.4 dBmV 41.5 dB 740400126 2194 3136
27 Locked QAM256 40 435000000 Hz -3.7 dBmV 41.3 dB 740409166 1976 2938
28 Locked QAM256 41 441000000 Hz -3.5 dBmV 41.2 dB 740427063 2036 2799
29 Locked QAM256 43 405000000 Hz -2.4 dBmV 42.3 dB 740428509 2490 4412
30 Locked QAM256 44 411000000 Hz -2.6 dBmV 42.1 dB 740231760 2361 3521
31 Locked QAM256 45 417000000 Hz -2.9 dBmV 42.0 dB 740439918 2364 3647
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0
Upstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power
1 Locked ATDMA 1 35600000 Hz 52.0 dBmV
2 Locked ATDMA 2 29200000 Hz 52.5 dBmV
3 Locked ATDMA 3 22800000 Hz 53.0 dBmV
4 Locked ATDMA 4 16400000 Hz 53.3 dBmV
5 Locked ATDMA 5 39600000 Hz 52.3 dBmV
6 Not Locked Unknown 0 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Hz 0.0 dBmV
Downstream OFDM Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power SNR / MER Active Subcarrier Number Range Unerrored Codewords Correctable Codewords Uncorrectable Codewords
1 Locked 0, 1, 2, 3 37 690000000 Hz -1.4 dBmV 39.8 dB 1048 ~ 3047 24586185 22095365 0
2 Not Locked 0 0 0 Hz -1.8 dBmV 0.0 dB 0 ~ 4095 0 0 0
Upstream OFDMA Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked Unknown 0 0 Hz 0 dBmV
2 Not Locked Unknown 0 0 Hz 0 dBmV
Current System Time: Mon Apr 11 21:59:16 2022
System Up Time: 4:50:03

[plemans]

You have errors in your line and connection issues in your logs. 

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. And some ISP’s charge if the wiring issue is in the home. So this helps prevent this.

If that doesn't help, the ISP needs to check the line.