Monitor goes black for a second randomly when gaming

[SmilesRising]

Hello! I've got this monitor: https://www.inet.se/produkt/2218993/lg-27-ultragear-27gp850-qhd-nano-ips-180-hz and sometimes when im playing games the screen goes black for a few seconds and then comes back. The screen does not disconnect from the pc, it just flashes black 

This happens at random intervals. Sometimes several times during one night and sometimes it can go weeks without issues..

 

I've tried updating my gpu drivers, updating the monitor, changed display cables, disabled g-sync, changed refresh rate and switched outlet for the monitor but the issue is still there.. any advice on what to do?

 

The issue ONLY happens while gaming, never when just watching movies or surfing the web..