Issues With Connection Drops After Xfinity Maintenance

Hello! I recently received a message about some necessary network maintenance that Xfinity would be doing in my area on Friday 3/28. I was not having any connectivity issues at the time, and my connection was rock solid. The maintenance was completed within a few hours. After that point, I started to experience connection drops several times a day. The drops are enough to cause interruptions with several applications, and appeared to worsen during the evening of Monday 3/31, with two longer connection drops occurring.

I confirmed in my modem UI (Arris S33) that several downstream channels, specifically channels 13 through 31, are showing as Not Locked. There are also several thousand uncorrectable errors on channel 32. The SNR/MER and power on channel 32 and 33 are noticeably worse than that of channels 34-43.

I replaced the splitter and grounding block at the box, as well as the cable modem itself with a new Arris S33, to see if any of those items could be responsible. However, I noticed the same behavior and downstream channel status with the new parts in place as well.

Please let me know what the best course of action is to resolve, or if you need any additional detail from my end.

Thank you!