Computer randomly turning off?

[the1collin]

Hey everybody i have a very VERY weird issue here and i have no idea how to fix it or where to even start. i originally thought it was the psu but i dont really know. So basically during using my computer *Not just gaming* my computer will turn off just out of no where. the power button will stop working so what i do is tap my case a few times and it turns on???? i dont know either. the power button does work once booted and on a normal shut down. but the shut down even is very random. for example i was playing for a good 3 hours last night and didnt shut down but it kept shutting down randomly before that and the next day it shut down still too. i have reseated my cpu, graphics card, ram, checked my power button, ran stress test, checked tempatures checked shut down logs limited cpu power limited gpu power reformatted my computer twice disabled windows update and finally update to windows beta. I cant find anything  So please help me and here are my specs:

 

Corsair vengeance rgb pro 16gb 3200mhz c16

asus rog strix gtx 1660 super advanced 6gb

amd ryzen 5 2600

evga 500 w1 80+ White 

Nzxt h510

asus rog strix b450-f gaming motherboard atx amd ryzen 2 am4

 

thanks!