Very interesting, the only thing I could think of is you rattled up your hdd (which probably would have broke it but if it works then that’s probably not the issue) or windows 10 in all it’s glory is just messing with you, it’s happened to me with my WiFi lol. But this doesn’t sound like a psu issue, sounds like windows 10 or your motherboard is having some issue. My money would be windows 10 though.