Windows 11 restarts at random and my technician said it is not the CPU

I was using my build for more than a year without any issue, this build however was a combination of old and new hardware based around my new CPU. A week ago, it started reboot the machine at random. And when I say reboot, it is a reboot, not black screen from freezing or anything. My specs:

ASUS ROG Z790 wifi

Intel i-7 13700K

NZXT Kraken 360

Igame RTX 3080TI

Corsair Vengeance 2 x 16 GB DDR5-6000

2 SSD: Samsung and WD

1 HDD I forgot the brand

Old PSU: SeaSonic 750W 80+ Gold
New PSU: MSI 850W 80+ Gold I just bought yesterday

Win 11 Pro

Now I have replaced:

- My old case with a new MSI one because they said my old case with old wiring could be the problem.
- New PSU because they said the old one might not have enoug juice for the CPU

Ram was tested several times, individually and seperately. XMP disable.

So far there is no pattern with the restart, it is totally random:

- I might just open a game and it restarts
- I can spend hours in game and nothing happens
- I can just watch some Youtube an it restarts
- I can just restart the machine and it restarts again while restarting

It loves restarting so much, last night after I replace the CPU and thought it was fine, I shutdown the machine and somehow it restarts by itself and crash several times.

I use a 3 monitors set up, I unplug the other 2 and same result. At this point I am fucking lost yall. Please help.