I have 6900xt sapphire + rysen 9 5900x and im started experience driver timeouts mostly since January/February 2022. It gave me one just watching a video on twich and it gave everytime playing battlefield 4, this is annoying. Already DDU my drivers, windows updated, GPU+CPU stock, updated directx but still nothing. I think that can be the newest drivers that have problems but i dont know.
I only can confirm your issues. I got the card about a month ago and it started a week ago. I have no idea what is wrong. I saw a few people suggesting a better PSU. Mine is delivering 850W which might not be enough ?! I'm using two 12V Lanes so two connector cables but maybe it's not enough ... I will test a 1000W PSU tomorrow and will report the result