Frequent T3/connection drops, inconsistent speeds over the last several days

Hello all,

 

I'd like to preface this by saying that while the official Comcast outage detector doesn't show anything in my neighborhood, several 3rd party websites have indicated reports of internet troubles in my area. I also have not changed any hardware or config settings for months, while this problem just started this week (although a very similar problem occurred about 2 months ago and lasted for about a week before spontaneously resolving itself).

 

For several days now my internet has dropped completely for minutes at a time, and that occurs about 4-8 times a day. By "dropped completely," I mean that neither a ethernet-connected nor a wifi-connected device works (the icon in the Windows system tray shows that yellow triangle indicating a connection issue). After about 5 to 10 minutes, the problem resolves itself, and resetting/power cycling the modem does not fix it any more quickly. Furthermore, wifi devices can still access the router during this downtime, so I believe the problem is with the modem or somewhere upstream from there.

 

In addition, the internet intermittently (1-3 times an hour) slows to a crawl -- when this happens, watching a video or a stream at 360p will cause it to buffer for about 15-30 seconds, and the latency meter in an online game I'm playing skyrockets to about 3 seconds from the normal 40 ms. Again, after those 15-30 seconds pass, everything returns to normal, but it happens even more frequently than the complete disconnections I mentioned above.

 

I'm using an Arris SB6183 modem with a TPLink Archer A7 router. My devices connect via wifi, via direct connection to the modem, and via a powerline adapter from the room directly above the modem. I have also power cycled the modem and router many times throughout. 

 

I'm having trouble uploading the modem information directly to this post, so here is an imgur link: https://i.imgur.com/0adVQ2C.png

 

And here are the event logs for the modem:

 

Sat Dec 07 20:51:06 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Sat Dec 07 21:45:26 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Sat Dec 14 11:56:01 2019	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Sat Dec 14 18:19:13 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Sat Dec 14 18:24:06 2019	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Sat Dec 14 19:41:37 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Sat Dec 14 19:45:49 2019	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Sat Dec 14 19:45:57 2019	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Sat Dec 14 20:28:23 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Sat Dec 14 20:32:43 2019	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 07:57:29 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 08:01:49 2019	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 08:55:04 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 08:59:24 2019	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 10:55:18 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 10:59:38 2019	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Time Not Established	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Time Not Established	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out
Mon Dec 23 12:28:21 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 12:28:21 2019	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 12:28:21 2019	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 12:28:59 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 12:28:59 2019	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 12:28:59 2019	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 12:52:07 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 12:56:27 2019	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Mon Dec 23 13:03:23 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 13:03:23 2019	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 23 13:03:23 2019	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 02:33:40 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 02:33:40 2019	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 02:33:40 2019	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 16:34:48 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 16:34:48 2019	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 16:34:48 2019	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 17:28:32 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 17:28:32 2019	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 17:28:32 2019	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 0;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 17:28:46 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 17:28:46 2019	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 17:28:46 2019	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 17:44:20 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 17:44:20 2019	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 17:44:20 2019	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;
Tue Dec 24 18:41:53 2019	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=bc:2e:48:d9:ac:0c;CMTS-MAC=00:01:5c:7a:9c:6a;CM-QOS=1.1;CM-VER=3.0;