Connection keeps dropping, fixes itself temporarily after resetting modem

I think I'm having the same issue as this one.

I recently moved to a new home. I had xfinity in my old place, and I never had problems with connectivity. I moved my whole setup, unchanged, to my new place, and now I keep losing internet connectivity every so often. I have to turn the modem off and on again, which fixes the issue for a few minutes/hours/a couple of days, but then the same thing happens. I feel pretty confident that my downstream setup (MikroTik router, Grandstream APs) isn't to blame - it's unchanged from my old house, and every time I've had this issue I've moved right next to an AP (which is wired to the router) to confirm.

I use a Motorola MB8611. The cable entering the house goes straight into the modem without any filters/splitters getting in the way.

Here's the event log from my modem:

    Time Not Established
        Critical (3)       SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    19:54:16
Thu May 29 2025        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    10:06:09
Sun Jun 1 2025        Critical (3)       Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    10:06:11
Sun Jun 1 2025        Critical (3)       SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    11:31:42
Sun Jun 1 2025        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    12:17:29
Tue Jun 3 2025        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    12:47:09
Tue Jun 3 2025        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    15:29:37
Thu Jun 5 2025        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    20:58:31
Sat Jun 7 2025        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    09:34:45
Sun Jun 8 2025        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    23:05:23
Wed Jun 11 2025        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established
        Notice (6)       Honoring MDD; IP provisioning mode = IPv6
    08:37:42
Sat Jun 14 2025        Notice (6)       DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    08:37:52
Sat Jun 14 2025        Critical (3)       UCD invalid or channel unusable;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
    08:39:41
Sat Jun 14 2025        Notice (6)       CM-STATUS message sent. Event Type Code: 24; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

Xfinity support only lets me talk to the chatbot, which tells me to restart everything and then assures me that everything is perfect. I'm not sure what to do next. Any help is greatly appreciated!