Why does a new computer go to reboot?

Question

Computers

The new computer goes to reboot after entering games / after some time spent in the game (any)
Asrock b550m pro 4
Ryzen 5 5600x
Msi 3060 12gb Crucial
ballistix 3200 1.35
Be quiet 700w 80 bronze
) on the xmp profile 3200 goes a little faster (it also probably happened by accident)
On the xmp profile, I ran a memtest (from a flash drive) without errors.
The video card was warming up in the furmark for 15 minutes, the temperature did not rise above 61. I
ran the Aida test for 10-15 minutes with checkmarks for gpu memory and percent. The percent warmed up to 71, the video card did not seem to overheat either.
Drivers on vidyuhi latest.

Answer 1

It looks like a memory.
1. Memory must be inserted in the second and fourth slot.
2. Run extended memtest in 6-8 passes.