Computer rebooting on it's own, freezing on motherboard boot screen. Unplugging / plugging fixed it for now...

My windows machine has been randomly rebooting itself and this morning it kept freezing on the Auros boot screen even after multiple hard reboots.

I unplugged it and plugged it back in and it was able to get into Windows finally so I can at least backup some files.

Any ideas what might be causing it? Bad motherboard? Bad power supply?

I'll probably take it in to have someone look at it but just want to have some ideas to ask the techs about.

Specs:

AMD Ryzen 7 5800

32 GB RAM

GIGABYE B550 Aorus Pro Motherboard

NVIDIA RTX 3070

Power supply 850 Watt