Thought I'd share this information to help if others have/ had the same problem.  After installing the Nov 2021 update, every time I tried to reboot I had problems with the remote set up where I kept getting "Bluetooth keeps shutting off".   As fyi, I have an ethernet connection so the WiFi was not active.   After a few attempts to figure out things, I decided to turn off my smart phone and ensure no other device with Bluetooth was turned on (eg, laptop) - to avoid interference.  Then after rebooting and trying again, it worked and didn't get this problem.  Not sure I found the right problem but thought I would give people another possible idea to check.