Connection drops T3 and T4 timeouts

Hello,

Since the start of August I have had many service issues with my Xfinity internet.

I own my own cable modem.

The modem upstream power looks like its maxed out almost and that is when the connection drops as I see in the modem logs T3 and T4 timeouts.

Issue: Internet connection T3 timeouts and T4. Modem restarts. 

 DOCSIS 3.0

Logs

Tue Aug 18 10:05:01 2026 Critical (3)
Started Unicast Maintenance Ranging - No Response received - T3 time-out;

CM-MAC=xxxxxxxxxx ;CMTS-MAC=XXXXXXXXXXXXXXx ;CM-QOS=1.1;CM-VER=3.0;

Tue Aug 18 10:06:14 2026 Critical (3)
Received Response to Broadcast Maintenance Request, But no Unicast
Maintenance opportunities received - T4 time out;

CM-MAC=xxxxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.0;

Time Not Established Critical (3) No Ranging Response received - T3 time-out

Tue Aug 18 10:12:39 2026 Critical (3)
Started Unicast Maintenance Ranging - No Response received - T3 time-out;

CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxx;CM QOS=1.1;CM-VER=3.0; 

Tue Aug 18 10:13:44 2026 Critical (3)
Received Response to Broadcast Maintenance Request, But no Unicast
Maintenance opportunities received - T4 time out;

CM-MAC=xxxxxxx;CMTS-MAC=xxxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

Tue Aug 18 11:44:19 2026 Critical (3)
Started Unicast Maintenance Ranging - No Response received - T3 time-out;

CM-MAC=xxxxxx;CMTS-MAC=xxxxCM- QOS=1.1;CM-VER=3.0;

Time Not Established Critical (3) No Ranging Response received - T3 time-out

Wed Aug 19 08:47:58 2026 Critical (3)
Started Unicast Maintenance Ranging - No Response received - T3 time-out;

CM-MAC=xxxxxxx;CMTS-MAC=xxxxxxx ;CM- QOS=1.1;CM-VER=3.0;

All my coax cables are wrench tight. I have swapped out wires from the wall to the modem.

I live in an apartment complex.

There appears to be others having issues in the area also as last week I received a few messages that Xfinity that they 'notified issues and were doing maintenance.

Then I got a message saying I could request a tech.

So I requested on for later in the week but by then the issue seemed to go away so I opted to cancel the appointment via the automatized system.

Back at it again this week with issues....

This seems to a chronic problem for the area with what I would think is many band aids based on other things I see happening

with the Xfinity trucks in the area.

Can I get some assistance for myself and the others in this complex?