Motorola MB8611 modem keeps restarting - firmware issue

I have owned my own Motorola MB8611 cable modem since September 2022, and since the middle of December 2022 it has been restarting multiple times per day. After a lot of troubleshooting, I figured out that it is related to the firmware, aka software. With Firmware 8611-19.2.20 it is stable, but then Xfinity updates it to 8611-21.3.7. The update causes it to reset, disrupting my internet service for a few minutes. Then the modem restarts a few times within an hour, disrupting the internet service every time. After two restarts, the firmware reverts to 8611-19.2.20, and my internet service works until Xfinity detects that the firmware needs to be updated (usually a few hours). The firmware gets updated to 8611-21.3.7, and the resetting process repeats on and on. I tried resetting the modem by pressing the reset button, and this doesn't stop this problem from happening.

Based on what I've read in this forum, this is a VERY COMMON issue.

Can you help me, and everyone else with this modem, solve this issue so our internet is stable again? Is it an issue with Xfinity or an issue with Motorola? I have temporarily switched back to my old cable modem, but I'd like to be able to use this MB8611 modem because it is capable of much faster speeds than my old modem.

Thanks.