C7000v2 Keeps Resetting

[carl4638]

I've been experiencing this issue for months now that randomly, there's no fixed time when this happens could be 10pm could be 6am. My C7000v2 router will reset. It won't lose power, but almost all the lights on the front go compeltely yellow for a few seconds then turn off, the power light remains on and green, but router then spends a couple minutes rebooting and after a couple minutes the internet comes back as normal. It can do this anywhere from 1 to 6 or 7 times a day. I've reseated the power, ethernet, and coax cables on both ends of the device and the other ends, making sure everything is fully plugged in and there's no rips or bends in any of the cables. I've tried powercycle the device, I've factory reset the device. I've done an ipconfig /release and ipconfig /renew and nothing resolves the issue. I've consutlted Xfinity support on the issue and they can't recommend anything I haven't tried

I can't afford another router and desperately need to get this fixed.

I can provide any more information needed

C7000v2

Firmware Version 1.03.03

[plemans]

Log into the device a take a screen snip of the event log and the cable connections page. 

Those can tell us if there's line issues causing it or if the reset signal is being sent by the ISP or CMTS.

[carl4638]

NOTE: REMOVED CMAC AND MAC FOR PRIVACY

UPSTREAM/DOWNSTREAM

Startup Procedure

Procedure Status Comment Acquire Downstream Channel 573000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enabled BPI+ IP Provisioning Mode Honor MDD honorMdd(4)

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 29 573000000 Hz 5.5 dBmV 40.5 dB 0 0 2 Locked QAM256 41 645000000 Hz 5.2 dBmV 40.3 dB 0 0 3 Locked QAM256 42 651000000 Hz 5.6 dBmV 40.4 dB 0 0 4 Locked QAM256 43 657000000 Hz 5.9 dBmV 40.5 dB 0 0 5 Locked QAM256 44 663000000 Hz 6.3 dBmV 40.7 dB 0 0 6 Locked QAM256 25 549000000 Hz 5.3 dBmV 40.5 dB 0 0 7 Locked QAM256 26 555000000 Hz 5.2 dBmV 40.5 dB 0 0 8 Locked QAM256 27 561000000 Hz 5.2 dBmV 39.8 dB 0 0 9 Locked QAM256 28 567000000 Hz 5.4 dBmV 40.6 dB 0 0 10 Locked QAM256 30 579000000 Hz 5.5 dBmV 40.3 dB 0 0 11 Locked QAM256 31 585000000 Hz 5.4 dBmV 40.2 dB 0 0 12 Locked QAM256 32 591000000 Hz 5.4 dBmV 40.1 dB 0 0 13 Locked QAM256 33 597000000 Hz 5.2 dBmV 40 dB 0 0 14 Locked QAM256 34 603000000 Hz 5.1 dBmV 40 dB 0 0 15 Locked QAM256 35 609000000 Hz 5.1 dBmV 40 dB 0 0 16 Locked QAM256 36 615000000 Hz 5 dBmV 39.9 dB 0 0 17 Locked QAM256 37 621000000 Hz 4 dBmV 39.9 dB 0 0 18 Locked QAM256 38 627000000 Hz 3.8 dBmV 39.9 dB 0 0 19 Locked QAM256 39 633000000 Hz 3.9 dBmV 39.9 dB 0 0 20 Locked QAM256 40 639000000 Hz 4.1 dBmV 40.2 dB 0 0 21 Locked QAM256 21 525000000 Hz 5.2 dBmV 40.3 dB 0 0 22 Locked QAM256 22 531000000 Hz 4.9 dBmV 40.3 dB 0 0 23 Locked QAM256 23 537000000 Hz 4.9 dBmV 40.3 dB 0 0 24 Locked QAM256 24 543000000 Hz 4.8 dBmV 40.4 dB 0 0

Upstream Bonded Channels

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 1 5120 Ksym/sec 16400000 Hz 43.4 dBmV 2 Locked ATDMA 2 5120 Ksym/sec 22800000 Hz 43.3 dBmV 3 Locked ATDMA 3 5120 Ksym/sec 29200000 Hz 42 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 35600000 Hz 41.8 dBmV 5 Locked ATDMA 5 2560 Ksym/sec 40400000 Hz 42 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

Time Priority Description 2022-1-11, 13:38:48 Notice (6) WiFi Interface [wl0] set to Channel 4 (Side-Band Channel:N/A) - Reason:INTERFERENCE 2022-1-11, 13:38:47 Notice (6) WiFi Interface [wl1] set to Channel 128 (Side-Band Channel:N/A) - Reason:INTERFERENCE 2022-1-11, 13:38:44 Notice (6) WiFi Interface [wl0] set to Channel 4 (Side-Band Channel:8) - Reason:GUI 2022-1-11, 13:24:30 Notice (6) WiFi Interface [wl0] set to Channel 6 (Side-Band Channel:N/A) - Reason:INTERFERENCE 1970-1-1, 00:00:49 Notice (6) Honoring MDD; IP provisioning mode = IPv6 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, 00:00:40 Notice (6) WiFi Interface [wl0] set to Channel 11 (Side-Band Channel:N/A) - Reason:INIT 1970-1-1, 00:00:37 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing: 1970-1-1, 00:00:38 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;; 1970-1-1, 00:00:39 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;VER=3.0;

[plemans]

You  must have just rebooted it. Try it after its ran for a while or after it does a reboot cycle

[carl4638]

Router was working mostly fine today until a few minutes ago. I pulled this from Event logs just now

1970-1-1, 00:00:49	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
1970-1-1, 00:00:40	Notice (6)	WiFi Interface [wl1] set to Channel 128 (Side-Band Channel:N/A) - Reason:INIT
1970-1-1, 00:00:40	Notice (6)	WiFi Interface [wl0] set to Channel 4 (Side-Band Channel:N/A) - Reason:INIT
1970-1-1, 00:00:39	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;
1970-1-1, 00:00:37	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;
1970-1-1, 00:00:38	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;
1970-1-1, 00:00:39	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing

[plemans]

Seems like your logs are clearing out in the reboot. that makes it more of a challenge because now we're just guessing. 

1 thing you can try is if you have a seperate power supply sitting around that has the same voltage and polarity and AT LEAST the same amperage rating (it can have more but not less), try that. Maybe the power supply is going out and failing under load/heat.