I was playing Overwatch a few days ago and I alt tabbed after a match, instead of seeing my desktop, I had a black screen and couldn't do anything, no sound, no cursor, ctrl shift esc didn't work, nor did alt tab. Ctrl alt del didn't do anything either. I rebooted, and tried alt tabbing a few times and nothing happened, so I didn't think much of it. Today however, whilst play Warframe, I alt tabbed and again the same thing happened. When I checked event viewer, there was nothing out of the ordinary, heck, there wasn't even a log in System during that time. What could this be? I don't alt tab often, but it seems randomly this issue occurs. Is this my driver's fault? I'm currently on 17.1.1 for my R9 380. I also have an i5 6600k. The background apps I had running both times were Discord, and Avast (game mode on). Any help would be nice, thanks.