I think you should make a help thread describing the problem in detail and what you have tried so far and your exact system specs. There we can better asses the problem and provide suggestions, there are people here much better and more experienced than me that can provide suggestions.
I highly doubt its your PSU, but some older psu or dying psu cannot deal with transient spikes on the GPU.
First I would do fresh install of Windows and then install the games you have been having issues with on NVME. Install all latest drivers from your manufacturer of motherboard. Then test again but make sure you don't install too much software try to keep it as bare as possible.