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Ryan-F's avatar
Ryan-F
Aspirant
Feb 26, 2023

CM2050V Spotty internet connection

Hi everyone, I replaced my XB7 with a CM2050V about 20 days ago. Ever since then the internet has been highly unreliable. All power levels are within spec and SNR is above 45db. There are no errors e...
Troubleshooting
FURRYe38's avatar
FURRYe38
Guru - Experienced User
Feb 26, 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

 

Be sure your using a good quality LAN cable between the modem and router. CAT6 is recommended. 
What is the brand and model of the host wifi router connected to the modem?

Ryan-F's avatar
Ryan-F
Aspirant
Feb 26, 2023

Event Log: 

 

Sun Feb 26 13:14:26 2023(Notice (6))CM-STATUS message sent. Event Type Code: 1; Chan ID: 7; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:14:17 2023(Warning (5))MDD message timeout;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:14:13 2023(Notice (6))CM-STATUS message sent. Event Type Code: 5; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:14:01 2023(Critical (3))No Ranging Response received - T3 time-out;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:13:55 2023(Critical (3))SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:13:55 2023(Notice (6))DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:13:53 2023(Notice (6))TLV-11 - unrecognized OID;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:13:45 2023(Notice (6))Honoring MDD; IP provisioning mode = IPv6
Sun Feb 26 13:13:37 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:13:35 2023(Warning (5))Lost MDD Timeout;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:13:28 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:13:27 2023(Warning (5))Lost MDD Timeout;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:13:20 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:13:11 2023(Notice (6))TLV-11 - unrecognized OID;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f: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=08:36:c9:b4:7b:c0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:09:17 2023(Critical (3))Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:09:17 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:09:13 2023(Critical (3))Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:09:13 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:08:29 2023(Warning (5))MDD message timeout;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:08:29 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:08:23 2023(Warning (5))MDD message timeout;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:08:22 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:05:56 2023(Notice (6))CM-STATUS message sent. Event Type Code: 5; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:05:55 2023(Notice (6))CM-STATUS message sent. Event Type Code: 1; Chan ID: 11; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:05:39 2023(Warning (5))MDD message timeout;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:05:21 2023(Notice (6))DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:05:20 2023(Notice (6))TLV-11 - unrecognized OID;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:05:11 2023(Notice (6))Honoring MDD; IP provisioning mode = IPv6
Sun Feb 26 13:05:02 2023(Warning (5))Lost MDD Timeout;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:04:53 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:03:53 2023(Critical (3))Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:03:53 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:03:49 2023(Critical (3))Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:03:49 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:03:48 2023(Critical (3))Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:03:48 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:03:45 2023(Critical (3))Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
Sun Feb 26 13:03:45 2023(Critical (3))SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=08:36:c9:b4:7b:c0;CMTS-MAC=00:90:f0:6f:08:00;CM-QOS=1.1;CM-VER=3.1;
  • FURRYe38's avatar
    FURRYe38
    Guru - Experienced User
    Feb 26, 2023

    I see lots of Criticals in the events log that the ISP needs to review and resolve.

     

    Lets take a look at the cable connections page please...

    • Ryan-F's avatar
      Ryan-F
      Aspirant
      Feb 26, 2023

      I do not know why the connections post keeps disappearing on me. I've posted it 3 times now. 

      • FURRYe38's avatar
        FURRYe38
        Guru - Experienced User
        Feb 26, 2023

        Put it in a PDF file then attach it using the Choose File button on your next post.