Over the past two or three days, my PC has been randomly shutting off with no warning, under both stress and idle. Once this has happened, my PC will not power back on until I've removed the power cable and reattached it; it will usually boot up again with no problems, although once it managed to boot without having to mess with the PSU and I was presented with the power surge screen, before being taken to the bios and then the typical boot process. The PC refusing to turn on after turning off makes me feel like it may be an issue with my CPU overheating, which I have noticed lately it is getting quite high, and my motherboard turning it off, rather than my PSU having a fault. I'll include a link to my specs and their temps at idle below.
https://i.imgur.com/0ZjUD7j.png
https://i.imgur.com/0ZjUD7j.png