Frequent T3 timeouts since outage last month despite good signal levels

My area had an outage last month (I got an automated text saying "We're aware that you may be experiencing a service interruption at <address>. We're working to resolve the issue by approximately 01/12/2025 09:40 PM (Eastern). We apologize for any inconvenience. We'll text you when it's resolved."). Ever since the outage, I've had frequent "T3 time-out" errors that result in a loss of connection. Sometimes it recovers on its own, and sometimes I need to power cycle my modem before it will reconnected. The exact error reported by the modem is "No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;".

I've been tracking the signal levels on my modem. Prior to the outage, my modem was averaging a downstream signal of +3 dBmV, downstream SNR of 40.5 dB, and upstream signal of 35 dBmV. After the outage, the downstream signal and SNR are unchanged, but the upstream signal levels are now up around 41 dBmV. My understanding is that this is still within the acceptable range, although it's concerning to me that it's so much higher. I've already removed all the splitters inside my home - the cable modem is connected directly to the cable coming in from the street.

Here's a graph of the signal levels over time. You can see the connection was rock-solid before the outage on 1/12, and you can see how many "T3 time-out" outages have happened since then.

I imagine this is something marginal in the Comcast network, perhaps that was physically disturbed on 1/12. How do I get someone to investigate the problem? The automated assistant just says "I don't see any problems with the signal to your home." and won't let me troubleshoot further. Thanks for the help!