Question Why does the image on my primary monitor sometimes disappear ?

[r_tsygankov]

Hey. I have a difficult technical question.
I have a computer, 2 monitors (primary DPort, secondary HDMI).

Sometimes the image on the primary monitor disappears. (2-3 seconds black screen, monitor power supply is normal).
The secondary monitor is running at this time. both monitors are connected to the same video card.

I've tried replacing DPort cable. The problem was not solved.

I watched the Windows log. There were no problems with the system or programs at this time.

Interestingly.
Six months ago I had another computer. (no components from it are in the new computer). I used my secondary monitor as my primary monitor. And I had this problem too.

What can be wrong?

P.S. Power Supply Be Quiet 750w/ Video GTX 1660 Super

 

[Vic 40]

Have that to, but two pc's one monitor, have a feeling it's something to do with the drivers from Nvidia, have Nvidia in each system. Some kind of bug, can only hope they fix it.

 

[r_tsygankov]

any opinion?