The monitor turns off after 20 minutes. and removed from the list of devices! What is the problem?

Question

Monitors

There are 2 monitors BENQ GW2765 and LG 27GL83, both connected via Display Port.
After 20 minutes of inactivity, both monitors go out, after which, after another 30 minutes, the BENQ monitor is somehow removed from the system, and when I move the mouse so that they light up again, the characteristic sound of connecting a new device is heard and all windows placed on this monitor are sent to LG. It is very uncomfortable. How to fix?
Both monitors individually work as they should without problems.

Answer 1

Perhaps the cable is constantly moving away, check the cable or try another one.
But perhaps the reason is in the video card, try these methods