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.