My internet connection has been spotty/unstable and I have no idea why.
My equipment:
C7000 – Nighthawk AC1900 WiFi Cable Modem Router (Firmware Version V1.01.32) connected via wall jack
Spectrum high speed internet (200 mbps)
Dell Latitude 3470 laptop hard-wired via Dell docking station/hub D3100
Google Pixelbook connected via Wi-Fi
Several other devices (cell phones, Fire Sticks, etc., that haven't experienced any issues)
My symptoms:
Zoom video calls on Pixelbook (Wi-Fi) constantly drop; Zoom displays "connection unstable" notification
Chrome browser on Pixelbook (Wi-Fi) intermittently returns "err_address_unreachable" error; pages will typically load within a few seconds/minutes
Chrome browser on Dell laptop (hard-wired) returns "err_connection_failed" error every few days; problem resolves itself upon restart. (This problem seems to have begun when corporate IT upgraded my machine to Windows 10 in November)
Netgear event log (pasted in full below) shows numerous "SYNC Timing Synchronization failure" errors
What I've tried:
Numerous power cycles
Factory reset C7000
Changed DNS servers from default to Cloudflare
Changed 5GHz Wi-Fi channel from default (153) to 161 to avoid interference (diagnostics showed several other networks on same channel)
Spectrum came out last week to test my connection and inspect wiring and other physical connections, found nothing wrong
To be honest I'm totally lost at this point. I don't know if the problem is with my service or with my hardware. If it's my hardware, I don't know if it's faulty equipment or faulty ownership.
Please let me know what other information I can share. Thank you in advance for any help!
Cable Connection:
Startup Procedure
Procedure
Status
Comment
Acquire Downstream Channel
471000000 Hz
Locked
Connectivity State
OK
Operational
Boot State
OK
Operational
Security
Enabled
BPI+
IP Provisioning Mode
IPv6 Only
ipv6Only(1)
Downstream Bonded Channels
Channel
Lock Status
Modulation
Channel ID
Frequency
Power
SNR
Correctables
Uncorrectables
1
Locked
QAM256
33
471000000 Hz
8.4 dBmV
39.9 dB
0
0
2
Locked
QAM256
2
267000000 Hz
9.4 dBmV
42.1 dB
0
0
3
Locked
QAM256
3
273000000 Hz
9.4 dBmV
42 dB
0
0
4
Locked
QAM256
4
279000000 Hz
8.9 dBmV
41.7 dB
0
0
5
Locked
QAM256
32
285000000 Hz
9.3 dBmV
42 dB
0
0
6
Locked
QAM256
5
291000000 Hz
8.9 dBmV
41.8 dB
0
0
7
Locked
QAM256
6
297000000 Hz
9.5 dBmV
42.1 dB
0
0
8
Locked
QAM256
7
303000000 Hz
9 dBmV
41.8 dB
0
0
9
Locked
QAM256
8
309000000 Hz
9.8 dBmV
42.1 dB
0
0
10
Locked
QAM256
9
315000000 Hz
9.4 dBmV
41.9 dB
0
0
11
Locked
QAM256
10
321000000 Hz
9.6 dBmV
41.9 dB
0
0
12
Locked
QAM256
18
369000000 Hz
9 dBmV
40.9 dB
0
0
13
Locked
QAM256
19
375000000 Hz
8.8 dBmV
40.7 dB
0
0
14
Locked
QAM256
21
387000000 Hz
8.6 dBmV
40.4 dB
0
0
15
Locked
QAM256
22
393000000 Hz
9 dBmV
40.6 dB
0
0
16
Locked
QAM256
23
399000000 Hz
8.3 dBmV
40.2 dB
0
0
17
Locked
QAM256
24
405000000 Hz
9.3 dBmV
39.4 dB
0
0
18
Locked
QAM256
25
411000000 Hz
8.6 dBmV
39.1 dB
0
0
19
Locked
QAM256
26
417000000 Hz
9.7 dBmV
39.4 dB
0
0
20
Locked
QAM256
27
423000000 Hz
9.2 dBmV
39 dB
0
0
21
Locked
QAM256
28
447000000 Hz
9.5 dBmV
39 dB
0
0
22
Locked
QAM256
29
453000000 Hz
9.3 dBmV
38.8 dB
0
0
23
Locked
QAM256
30
459000000 Hz
9.2 dBmV
38.7 dB
0
0
24
Locked
QAM256
31
465000000 Hz
8.5 dBmV
38.9 dB
0
0
Upstream Bonded Channels
Channel
Lock Status
US Channel Type
Channel ID
Symbol Rate
Frequency
Power
1
Locked
ATDMA
28
5120 Ksym/sec
36800000 Hz
39.5 dBmV
2
Locked
ATDMA
25
5120 Ksym/sec
17600000 Hz
38.5 dBmV
3
Locked
ATDMA
26
5120 Ksym/sec
24000000 Hz
39.3 dBmV
4
Locked
ATDMA
27
5120 Ksym/sec
30400000 Hz
39 dBmV
5
Not Locked
Unknown
0
0 Ksym/sec
0 Hz
0.0 dBmV
6
Not Locked
Unknown
0
0 Ksym/sec
0 Hz
0.0 dBmV
7
Not Locked
Unknown
0
0 Ksym/sec
0 Hz
0.0 dBmV
8
Not Locked
Unknown
0
0 Ksym/sec
0 Hz
0.0 dBmV
Event Log: (I assume 1970 indicates errors that occurred prior to the factory reset?)
1970-1-1, 00:07:12
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:13
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:15
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:20
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:22
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:33
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:34
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:35
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:36
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:39
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:39
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:41
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:46
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:47
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:48
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:48
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:52
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:53
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:54
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:07:54
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:08:00
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:08:01
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:08:06
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:08:08
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:08:09
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:08:09
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:08:12
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:08:13
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:08:17
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:08:18
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:08:21
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:40
Notice (6)
WiFi Interface [wl0] set to Channel 11 (Side-Band Channel:N/A) - Reason:INIT
1970-1-1, 00:00:40
Notice (6)
WiFi Interface [wl1] set to Channel 153 (Side-Band Channel:N/A) - Reason:INIT
1970-1-1, 00:00:45
Notice (6)
Overriding MDD IP initialization parameters; IP provisioning mode = IPv6
2021-1-16, 15:00:58
Error (4)
Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:01:5c:8f:ac:55;CM-QOS=1.1;CM-VER=3.0;
2021-1-16, 15:00:58
Error (4)
Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=dc:ef:09:fc:66:08;CMTS-MAC=00:01:5c:8f:ac:55;CM-QOS=1.1;CM-VER=3.0;
2021-1-18, 11:40:31
Notice (6)
WiFi Interface [wl1] set to Channel 149 (Side-Band Channel:N/A) - Reason:INTERFERENCE
2021-1-18, 11:42:35
Notice (6)
WiFi Interface [wl1] set to Channel 128 (Side-Band Channel:N/A) - Reason:INTERFERENCE
2021-1-18, 14:08:19
Notice (6)
WiFi Interface [wl1] set to Channel 157 (Side-Band Channel:N/A) - Reason:INTERFERENCE
2021-1-18, 14:09:39
Notice (6)
WiFi Interface [wl1] set to Channel 161 (Side-Band Channel:N/A) - Reason:INTERFERENCE
I have the c7000 v2 and have been expericencing all kinds of drops and what seems like DNS issues.
My event log also looks alot like this and I does lead me to suspect that there is an issue with the hardware. I purchase my unit from Amazon, which i think may have been referbished as it was discounted and came in a basic brown box.
As a last ditch effort I am making sure that my wireless channels are free, being only devices are on those channels.
I may cave though anc just go buy a modem from Motorola or Arris.
I have never had these issues when using DSL and an Asus router.
It would be great if there was a way diagnose cable connections and the various errors that show on the logs from Netgear.
The fact that I'm having issues on a hard-wired PC and Wi-Fi-connected Chromebook (as well as my Android phone) tells me the issue is either with the Netgear device or the Internet service itself.
This weekend I replaced my coax (wall to modem router) and Ethernet cable (cat 5E patch to cat 6, now connected directly from the modem/router to the PC) and my problems persist. The only thing that seems to have helped a little bit is moving my Chromebook from the 5G band to the 2.4G band. I've still had drops, though, so I dunno.
