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bad cable, hdmi/dp, try another one
gsync/freesync can cause, but it seems you ruled that out
or bad backlight leds, when failing they will open and turn off all backlight til they cool and work again
if turning the backlight/brightness down, using the displays osd menu, and it does it less often, this is the problem
if it stays out for long enough, you can also use a very bright flashlight and put it directly to the panel, if you see a partial image around the light there is no backlight
This makes a cable/monitor hardware issue seem unlikely to me, but I will test more rigorously and try some of the things you suggested. Thanks