Same problem here in East Bay, California, starting late September. It stops responding every 1-8 days; a physical power cycle is the only way to recover it. Xfinity Chat "reprovisioned it", but it is still failing. Has anyone been able to resolve this?

Comcast just pushed the old firmware (V02.01.03) to my modem, replacing the broken V09.01.01! Fingers crossed that the problem is solved. 800-COMCAST was totally useless for this problem. I was told that Xfinity never changes the firmware (apparently they don't even have the capability to do so), that I should contact Netgear for support, etc. Over 10 calls resulted in the same result. Two techs came on site, and both said that it was a modem problem, but would not/could not solve it because it was my modem. I was repeatedly told to rent an Xfinity modem. DSL Reports was the only access to knowledgeable support. Although it was a slow interaction, they acknowledged the problem, investigated it, and said that a downgrade was forthcoming. Hopefully the company is rolling the downgrade out to everyone and not just those who find DSL Reports for help.

CM2050V unstable after Comcast updated firmware

18 Replies

FURRYe38
Guru - Experienced User
Oct 31, 2023
Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router
- garyhoooper
  Guide
  Oct 31, 2023
  Cable Diagnostic
  Status: Good
  Action:
  Your setup looks fine. If you can't access the internet, make sure you properly activated the modem. If modem has been activated and you still can't access the internet, contact your service provider for troubleshooting help.
  If you can access the internet but has other internet issue, the Netgear Cable Knowledge Base can provide additional troubleshooting info.
  CM Status: Good
  Downstream Status: Good
  Downstream Power Level: Good
  Downstream SNR Level: Good
  Upstream Status: Good
  Upstream Power Level: Good
  
  Current Time: Tue Oct 31 10:31:07 2023
  Startup Procedure
  Acquire Downstream Channel: 435000000 Hz Locked
  Connectivity State: OK Operational
  Boot State: OK Operational
  Security: Enabled BPI+
  IP Provisioning Mode: Honor MDD IPv6 only
  
  Downstream Bonded Channels
  Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
  1 Locked QAM256 4 435000000 Hz 1.7 43 0 0
  2 Locked QAM256 1 417000000 Hz 1.6 43 0 0
  3 Locked QAM256 2 423000000 Hz 1.5 43 0 0
  4 Locked QAM256 3 429000000 Hz 1.7 43 0 0
  5 Locked QAM256 5 441000000 Hz 1.1 42.8 0 0
  6 Locked QAM256 6 447000000 Hz 1.5 42.9 0 0
  7 Locked QAM256 7 453000000 Hz 1.6 42.9 0 0
  8 Locked QAM256 8 459000000 Hz 1.6 42.9 0 0
  9 Locked QAM256 9 465000000 Hz 1.3 42.8 0 0
  10 Locked QAM256 10 471000000 Hz 1.5 42.8 0 0
  11 Locked QAM256 11 477000000 Hz 1.4 42.8 0 0
  12 Locked QAM256 12 483000000 Hz 1.2 42.7 0 0
  13 Locked QAM256 13 489000000 Hz 1.3 42.7 0 0
  14 Locked QAM256 14 495000000 Hz 1 42.6 0 0
  15 Locked QAM256 15 501000000 Hz 0.9 42.5 0 0
  16 Locked QAM256 16 507000000 Hz 0.7 42.4 0 0
  17 Locked QAM256 17 513000000 Hz 0.8 42.5 0 0
  18 Locked QAM256 18 519000000 Hz 0.9 42.5 0 0
  19 Locked QAM256 19 525000000 Hz 0.6 42.5 0 0
  20 Locked QAM256 20 531000000 Hz 0.6 42.4 0 0
  21 Locked QAM256 21 537000000 Hz 0.6 42.3 0 0
  22 Locked QAM256 22 543000000 Hz 0.3 42.2 0 0
  23 Locked QAM256 23 549000000 Hz 0.1 42.1 0 0
  24 Locked QAM256 24 555000000 Hz 0.2 42.1 0 0
  25 Locked QAM256 25 561000000 Hz 0.4 42.2 0 0
  26 Locked QAM256 26 567000000 Hz 0.4 42.1 0 0
  27 Locked QAM256 27 573000000 Hz 0.2 42.1 0 0
  28 Locked QAM256 28 579000000 Hz 0.3 42.1 0 0
  29 Locked QAM256 29 585000000 Hz 0.4 42.1 0 0
  30 Locked QAM256 30 591000000 Hz 0.1 42 0 0
  31 Locked QAM256 31 597000000 Hz 0.1 41.9 0 0
  32 Locked QAM256 32 603000000 Hz 0.2 41.9 0 0
  Upstream Bonded Channels
  Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
  1 Locked ATDMA 2 5120 Ksym/sec 22800000 Hz 41.3 dBmV
  2 Locked ATDMA 1 5120 Ksym/sec 16400000 Hz 40.5 dBmV
  3 Locked ATDMA 3 5120 Ksym/sec 29200000 Hz 41.8 dBmV
  4 Locked ATDMA 4 5120 Ksym/sec 35600000 Hz 42.5 dBmV
  5 Not Locked Unknown 0 0 0 0.0
  6 Not Locked Unknown 0 0 0 0.0
  7 Not Locked Unknown 0 0 0 0.0
  8 Not Locked Unknown 0 0 0 0.0
  Downstream OFDM Channels
  Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
  1 Locked 0 ,1 ,2 ,3 193 957000000 Hz -2.42 dBmV 39.0 dB 148 ~ 3947 3151767 2159273 0
  2 Not Locked 0 0 0 Hz 0 dBmV 0 dB 0 ~ 4095 0 0 0
  Upstream OFDMA Channels
  Channel LockedStatus ProfileID ChannelID Frequency Power
  1 Locked 3 ,4 ,10 ,11 ,12 ,13 41 36200000 Hz 40.0 dBmV
  2 Not Locked 0 0 0 Hz 0 dBmV
  Event Log
  Time Priority Description
  Tue Oct 31 10:26:54 2023 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 10:26:48 2023 Notice (6) TLV-11 - unrecognized OID;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
  Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 10:23:59 2023 Notice (6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 12 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 10:23:43 2023 Warning (5) MDD message timeout;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 10:06:03 2023 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 10:05:56 2023 Notice (6) TLV-11 - unrecognized OID;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
  Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 10:04:50 2023 Warning (5) ToD request sent - No Response received;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 09:24:33 2023 Notice (6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 5 6 7 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 09:24:14 2023 Warning (5) MDD message timeout;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 09:24:13 2023 Notice (6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 5 6 7 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 09:24:04 2023 Warning (5) MDD message timeout;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 09:23:39 2023 Notice (6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 09:23:22 2023 Warning (5) MDD message timeout;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 08:47:19 2023 Notice (6) US profile assignment change. US Chan ID: 41; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 08:46:58 2023 Notice (6) US profile assignment change. US Chan ID: 41; Previous Profile: 13; New Profile: 12 13.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 08:46:52 2023 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 08:46:46 2023 Notice (6) TLV-11 - unrecognized OID;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
  Time Not Established Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 08:02:17 2023 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 08:02:13 2023 Notice (6) TLV-11 - unrecognized OID;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 08:02:03 2023 Notice (6) Honoring MDD; IP provisioning mode = IPv6
  Tue Oct 31 07:34:45 2023 Warning (5) ToD request sent - No Response received;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 07:33:49 2023 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 07:33:45 2023 Notice (6) TLV-11 - unrecognized OID;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 07:33:36 2023 Notice (6) Honoring MDD; IP provisioning mode = IPv6
  Tue Oct 31 07:23:58 2023 Warning (5) ToD request sent - No Response received;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 07:23:02 2023 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 07:22:57 2023 Notice (6) TLV-11 - unrecognized OID;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 07:22:49 2023 Notice (6) Honoring MDD; IP provisioning mode = IPv6
  Tue Oct 31 07:16:17 2023 Warning (5) ToD request sent - No Response received;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 07:15:21 2023 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 07:15:16 2023 Notice (6) TLV-11 - unrecognized OID;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 07:15:08 2023 Notice (6) Honoring MDD; IP provisioning mode = IPv6
  Tue Oct 31 07:08:35 2023 Warning (5) ToD request sent - No Response received;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  Tue Oct 31 07:07:38 2023 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:d5:83:00;CMTS-MAC=00:90:f0:25:08:00;CM-QOS=1.1;CM-VER=3.1;
  - FURRYe38
    Guru - Experienced User
    Nov 01, 2023
    Power levels are good.
    
    Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
    
    Be sure your using a good quality LAN cable between the modem and router. CAT6A STP is recommended.
    
    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.
    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, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
    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-Modems/m-p/1530376#M12853
    https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
    https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
    https://highspeed.tips/docsis-events/
    
    Be aware that the ISP is doing some mid-split configurations on there network. Something to ask them about.
Kitsap
Master
Nov 01, 2023
Please let us know if you have any success over on the DSL Reports Comcast Direct forum.

Have you requested help on the Reddit Comcast_Xfinity sub-forum?

https://www.reddit.com/r/Comcast_Xfinity/wiki/knowledgebase/next-generation-internet/

Forum Discussion

CM2050V unstable after Comcast updated firmware