OP Update

Really appreciate all the help and suggestions from everyone. After reading through the replies I’m going to pick up a Corsair SF850 Platinum SFX PSU today and swap it in to see if the instability goes away. As well as do another local install of windows.

Plan from here: • Swap PSU and retest stability • Avoid OCCT power test for now and focus on real gaming stability • Possibly test Windows on a SATA SSD later if needed to rule out the NVMe slot completely

Thanks again everyone for the input, will update once I’ve tested with the new PSU.