Internet disconnects/resets consistently when I try to upload a file

I am have an issue where internet connection keeps dropping. Since late last week it has happened maybe 2-3 times a day during normal browsing but it happens 100% of the time whenever I try to upload a file. It looks like the cable modem is resetting or rebooting because of a Ranging Response T3 timeout. The modem is a Motorola MB8600. I have had similar problems in the past - an XFinity tech visited ~3 months ago and reported finding some network issues in the neighborhood which were scheduled for repair at that time.

Modem logs covering the latest drop, MAC addresses have been redacted where they are nonzero:
 Time Not Established
   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=xxx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=xxx:5f;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
   Notice (6)   Honoring MDD; IP provisioning mode = IPv6
    08:57:12
Tue Jun 7 2022    Notice (6)   DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;