My PC restarts on its own, AMD 5700x3d and 7800xt?

So to sum up, my PC sometimes restarts, completely without warning or anything like that.

I have in the system:

AMD Sapphire Pure 7800XT

AMD Ryzen 7 5700x3d

Aorus B550 Elite V2 (latest bios)

BeQuiet Darkpower Pro 10 750watt

And cooling is done with an Msi Coreliquid 240r v2

The event hub only says "Power out unexpectedly"
Where could this be coming from? I really have no idea. I've already run benchmarks and monitored temperatures, but everything is normal.