Don't know where to ask about this problem but here goes.
I'm getting completely random black screens while the PC still runs in the background. I have no idea what's causing them since everytime it happens it really is random. The only thing that connects is that so far it has only happend when on the desktop and never during gaming. I have this problem with my Samsung MU6179 which I'm using as my PC monitor. I had a different 4K TV before this one and with that one had the same problem so I doubt it has anything to do with the TV but the PC. The PC and TV are connected with an HDMI cable, which is new, so that shouldn't be the problem either.