Upstream issue? "Started Unicast Maintenance Ranging - No Response received - T3 time-out"

Hi,

My xfinity internet connection has been randomly going off and then on repeatedly since yesterday.

2 days before, a xfinity tech came and buried and underground cable near my apartment building. The connection issues started the next day. Another technician came out today and said he'd tightened the cables or something and that it should resolve the issue but it did not.

I am attaching my modem log below. I use a Motorola MB7621 modem and the modem is brand new (purchased late June 2020 and opened in July 2020).

As seen below, all the times that connection issues occur there is a message in the log saying "Started Unicast Maintenance Ranging - No Response received - T3 time-out"

Please help!

 

Sorry, the images won't insert properly.. I am copy-pasting the information below.

Connection Status

System Up Time 0 days 01h:57m:17s             Network Access Allowed

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected 1 Locked QAM256 13 519.0 7.4 41.8 19 102 2 Locked QAM256 1 429.0 8.0 42.6 0 0 3 Locked QAM256 2 435.0 7.7 42.5 0 0 4 Locked QAM256 3 441.0 7.9 42.5 0 0 5 Locked QAM256 4 447.0 8.1 42.5 0 0 6 Locked QAM256 5 453.0 8.1 42.5 0 0 7 Locked QAM256 6 459.0 8.1 42.4 0 0 8 Locked QAM256 7 465.0 8.1 42.4 0 0 9 Locked QAM256 8 471.0 7.7 42.0 0 0 10 Locked QAM256 9 477.0 7.8 42.1 0 0 11 Locked QAM256 10 483.0 8.0 42.2 0 0 12 Locked QAM256 11 489.0 8.0 41.9 0 0 13 Locked QAM256 12 495.0 8.3 42.2 0 0 14 Locked QAM256 14 525.0 8.2 42.1 0 0 15 Locked QAM256 15 531.0 8.3 41.8 0 0 16 Locked QAM256 16 537.0 7.3 41.1 0 0 17 Locked QAM256 17 543.0 7.6 43.0 0 0 18 Locked QAM256 18 549.0 7.8 42.7 0 0 19 Locked QAM256 19 555.0 8.6 43.0 0 0 20 Locked QAM256 20 561.0 8.6 43.2 0 0 21 Locked QAM256 21 567.0 7.5 42.9 0 0 22 Locked QAM256 22 573.0 7.0 42.5 0 0 23 Locked QAM256 23 579.0 7.4 42.9 0 0 24 Locked QAM256 24 585.0 8.0 42.9 0 0 Total             19 102

Upstream Bonded Channels

Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV) 1 Locked ATDMA 2 5120 30.1 41.3 2 Locked ATDMA 1 5120 36.5 40.5 3 Locked ATDMA 3 5120 23.7 41.5 4 Locked ATDMA 4 5120 17.3 41.8 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 Frequency Setting

Downstream Frequency Select

Log

Time   Priority   Description   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.0;CM-VER=3.0;   Fri Jul 17 14:50:47 2020    Critical (3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Fri Jul 17 14:50:47 2020    Critical (3)   Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Fri Jul 17 14:50:47 2020    Critical (3)   16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Fri Jul 17 14:51:16 2020    Critical (3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Fri Jul 17 14:51:16 2020    Critical (3)   Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Fri Jul 17 14:51:16 2020    Critical (3)   16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Fri Jul 17 14:51:23 2020    Critical (3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Fri Jul 17 14:55:43 2020    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Fri Jul 17 14:56:05 2020    Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.0;CM-VER=3.0;   Fri Jul 17 14:56:24 2020    Critical (3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.0;CM-VER=3.0;   Fri Jul 17 15:12:00 2020    Critical (3)   Resetting the cable modem due to docsDevResetNow   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.0;CM-VER=3.0;   Time Not Established   Critical (3)   TFTP failed - Request sent - No Response;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.0;CM-VER=3.0;   Time Not Established   Critical (3)   TFTP Request Retries exceeded, CM unable to register    Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.0;CM-VER=3.0;   Fri Jul 17 15:22:29 2020    Critical (3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Fri Jul 17 15:26:49 2020    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Fri Jul 17 15:26:59 2020    Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.0;CM-VER=3.0;   Fri Jul 17 16:45:44 2020    Critical (3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Fri Jul 17 16:50:04 2020    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.0;CM-VER=3.0;   Sat Jul 18 12:57:38 2020    Critical (3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Sat Jul 18 12:57:38 2020    Critical (3)   Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Sat Jul 18 12:57:38 2020    Critical (3)   16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.0;CM-VER=3.0;   Time Not Established   Critical (3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.0;CM-VER=3.0;   Time Not Established   Notice (6)   Honoring MDD; IP provisioning mode = IPv6   Sat Jul 18 16:48:50 2020    Critical (3)   Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Sat Jul 18 16:53:10 2020    Critical (3)   Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.1;CM-VER=3.0;   Sat Jul 18 16:53:22 2020    Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:67:93:3e;CMTS-MAC=00:01:5c:6f:e6:58;CM-QOS=1.0;CM-VER=3.0;   Sat Jul 18 16:53:38 2020    Notice (6)   Honoring MDD; IP provisioning mode = IPv6