Like, never, except for games that sometimes don't release the screen when they crash. And it's been a while, at that.
The easy answer there is "don't play those games."
Since fall sometime, I do occasionally have one or both of my monitors take a 3-second "nap" (goes blank, comes back up like normal) and think it's probably a recent Windows update that's doing it. My work PC does it too, and since it's a Ryzen 2700U laptop vs. my Intel/nVidia machine at home, I'm pretty sure I can't blame "crappy AMD drivers" or something.