CM1000 intermittent outages from T4 resets

I've been troubleshooting intermittent connection outages for a while and first spent a lot of time on my router because it had the cursed ASUS firmware over the summer and I no longer trusted it. Finally ruling that out and replacing all ethernet cables, I moved onto my modem and the logs seem to reveal a common source of this issue: T4 timeouts. Concurrent with the latest outage I saw:

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=<removed>;CMTS-MAC=00:aa:6e:c0:af:8f;CM-QOS=1.1;CM-VER=3.1;

I also saw a T3 timeout earlier but there was no corresponding outage:

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=<removed>;CMTS-MAC=00:aa:6e:c0:af:8f;CM-QOS=1.1;CM-VER=3.1;

These outages occur for all devices on my network, both wired and wireless. The router's traffic monitor shows upload and download speed crater to <1kbps (which I'm assuming is actually zero). They occur daily but at random times making testing fairly difficult.

I had a technician scheduled for tomorrow but I've delayed them two days to troubleshoot a bit more from this info. This sounds similar to other issues like https://community.netgear.com/t5/Cable-Modems-Gateways/c7000v2-resets/td-p/2028769 so I'm hoping that my connection info can point me in the right direction. So far:

• I've had the ISP (Cox) send various forms of reset signals to the modem but have not yet done a factory reset (not sure if that is functionally different).
• I've ordered a new coax cable to test the path to the wall tomorrow (though like the other cables I have no reason to doubt this one other than being thorough).
• I live in an apartment building so I'm not 100% sure about the wiring, but I believe I'm connected to the jack closest to the source. After looking in building's utility closet I definitely have some questions about the cables in there (picture attached below).

Am I on the right track? Do the power and error values indicate anything in particular? Anything else I should be doing or not doing? And what should I tell the tech if/when they arrive? What are the odds the modem itself has gone bad in ~2 years?

Startup Procedure

Downstream Bonded Channels (Partial Service)

Upstream Bonded Channels

Downstream OFDM Channels

Upstream OFDMA Channels