T4 errors / constant disconnects

anyone experiencing these, or getting constant disconnects over the past 6 months?

Motorola MB8600.

running a 5 second ping connection test, so far i have 23 disconnects in less than 24 hours.

there are no splitters, and one single connection from the line inside my house.

 Wed Apr 4 18:18:13 2018    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:49:e6:5f;CMTS-MAC=2c:86:d2:89:e0:ef;CM-QOS=1.1;CM-VER=3.1;" 
 Wed Apr 4 18:18:24 2018    Notice (6)   Honoring MDD; IP provisioning mode = IPv4" 
 Wed Apr 4 18:18:27 2018    Warning (5)   DHCP WARNING - Non-critical field invalid in response ;CM-MAC=00:40:36:49:e6:5f;CMTS-MAC=2c:86:d2:89:e0:ef;CM-QOS=1.1;CM-VER=3.1;" 
 Wed Apr 4 18:18:27 2018    Notice (6)   TLV-11 - unrecognized OID;CM-MAC=00:40:36:49:e6:5f;CMTS-MAC=2c:86:d2:89:e0:ef;CM-QOS=1.1;CM-VER=3.1;" 
 Wed Apr 4 18:18:30 2018    Warning (5)   Dynamic Range Window violation" 
  • Hello,

    Do you have any splitters or signal amps on the cable line going to the modem?

    Thanks,

    Allan - Cox Support Forums Moderator.

  • no.  this was a fresh install done in May 2016, only one line into the house, only connected to internet.  no tv services, no other services.  only one coax outlet.  when I upgraded to 300mb, a tech even redid some of the wiring outside to clean it up.

    and now for over 6 months i have constant disconnects.  

    for today, as of 4:16pm, and now 8:06pm, I have had 12 disconnects.

  • You are NOT alone. I have experienced the same problems for over two years. I connected my old cable modem to see if that was it. Had problems with that and they told me the cable modem failed and they provisioned my new one incorrectly. I threw the old one away and reconnected it with the newer DOCSIS 3.0 one. The problems continued on and off the entire time I have been at my residence.

    We also have regular outages, which we are having another one for a 2nd day in a row right now. Terrible service in my area! I can't believe it, but I am actually considering DSL. I would rather have a lower speed stable connection than this high-speed intermittent connection. I mean, how much do you want to bet the same piece of local equipment is failing over and over again? You would think after the same area having outages so often, a senior tech would investigate why it is happening so often to try to come up with a long-term solution. It almost feels like they don't track that at all! 

    BTW: My logs are due to the outage. Otherwise, I normally get the T4 and IPV4 timeout issues as the original poster. The installer placed my splitter in a keyed box. I guess I'll have to look at that the next time I have issues. 

    Here are my logs:

    2018-4-6, 19:15:58 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:16:02 Warning (5) MDD message timeout;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:18:38 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:18:41 Warning (5) MDD message timeout;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:21:26 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:21:29 Warning (5) MDD message timeout;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:21:30 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
    2018-4-6, 19:21:33 Warning (5) MDD message timeout;CM-MAC=b0:7f:b9:2d:54:10;CMTS-MAC=28:52:61:29:d6:43;CM-QOS=1.1;CM-VER=3.0;
  • flitzanu,

    Would you try to a reset of your modem & bypass the router to see if you are still seeing the issue at the modem? We want to see if the issue is at the modem.

  • Hello KreepLV, We do see outages posted recently in your area. Modem also shows some concerns as well. If you would like to schedule and appointment to have a tech back out to the home. Please reach us on Twitter at @CoxHelp, visit us on Facebook, or email by at cox.help@cox.com. Provide us the name on the account with the full service address with a link to this thread so we can get started with setting up an appointment.