I feel for you. The WHEA problem is related to n variants. Some cases are the CPU, others the VGA, memory, source, cables or drivers. It sucks to do the identification. For that, just patience.
After 2 months with headaches caused by problems with the VGA RX 5700XT, I decided on two well-thought-out days to go to nVIDIA with the ASUS ROG STRIX RTX 3070. I have no regrets. It was Plug n 'Play! Plugged in, installed drivers, didn't even need to configure the drivers, played. That simple.
I will not return to AMD on VGAs until it improves design and drivers. I do not indicate for ANY VGAs of architectures derived from NAVI (v.1, v.2 and v.3).
I removed the RX 5700XT, put the RTX 3070 on and all my problems are over.
I want God to direct friends where the problem really is and that they be resolved as soon as possible.
So far my RX6800 is solid. With prices of cards and lack of availability, many want to try anything other than spend ~$1500 on a new card. Even the RX 5700 XT is going for ~$1k USD. Used around ~$800. So this is why most will fight as hard as possible to find work arounds, etc. As far as not returning to AMD, that's your personal choice and best of luck. I'm sure that Nvidia will do just fine. It's faster than the RX 5700 XT but stuck at the 8GB VRAM. The future is already moving towards the 16GB VRAM for VR and in some cases only a RTX3090 will pass for 8K. AMD will need to step up the game again.