Since recently, while I am in an dungeon instace in the middle of a battle my screen would go black.

Alt+tab; Alt+F4; Alt+Cntrl+Delete doesn't do anything.

I can still speak on Teamspeak while this happens.
There is no cursor on the screen.

I've waited for 3-6 minutes and it didn't change.
When forcefully restarting computer and log back in I find myself kicked out of the dungeon (they probably didn't want to wait around).

This was never an issue before the new update, and i dont seem to get these issues outside of an instance finder matchup.

Graphics Drivers are up to date.