Monitors freeze, no black screen, no blue screen. Just locks up and I have to hard reset by holding the power button. The keyboard and mouse does not respond.
Had a similar issue, is your pc dusty? if yes give it a good clean, this it what i did and fixed it.
Dusting it out didn't work. Might have pin pointed the problem to a game called Black Desert Online. The game running in the background while playing other games is probably making me run out of memory or something. Will monitor for a bit.