Are you using a convertor from digital to analog? Does this blanking happen in just one particular program, or in other programs too?
I have a 27" Samsung monitor.
Recently I installed a new video card which only has a digital output (GTX 1050) - I had my monitor connected to the old video card via the analogue output.
I have installed the latest video card and monitor drivers.
I am starting to notice that at times the monitor goes blank
(black screen) for about 1 - 2 seconds and there doesn't seem to be any pattern to this.
I feel that it is the monitor which is going blank and not the video card as when the monitor doesn't get a signal from the PC (eg when the PC is powered off and then back on) I get an small image image displayed briefly in the top left corner indication that it is connected via digital.
Any ideas what could be causing this?