I had a rock solid AMD RX 580 up until the release of kernel version 6.7. Now I’m lucky to get a system that can remain up for longer than thirty minutes. Sticking to 6.6 has worked for me and definitely something you should try as well, but it’s worth noting that any amount of time spent on the issue tracker for AMD GPU stuff will reveal tons of issues from 6.6 as well.
Check out Normcap.