Client crashing on the main screen while it remains "alive" on secondary screen

Hi,

I have an issue with client crashing. It happens when I run only one client on the main screen but also happens when I dual box with another client on another screen - note that only client on the main screen crashes. It happens regardless if main client is in fullscreen, fixed window or windowed more - secondary client is on another screen in window mode (as if I go fixed window or fullscreen it gets transferred back to the main screen).

I have 2x PG279Q at 144hz, G-sync enabled

Rig:
I70-10700k
32GB RAM
RTX 3070

Game is run from M2. SSD.
All drivers are updated.

(if needed more technical details about rig I can provide of course)

Any ideas what it could be?