D3 Monitor Killer

Hey,

so since this season my game keeps getting lower fps the longer I play (max about 30-45 minutes) and then my screens (using two monitors) turn black and no longer receive signal from my PC.

I can wait however long I want, they won't come back until I shut down my PC with the power button, which I hate to do...

Does anyone else have this problem? I've never had any problem like this with D3 (or any other game...), just with D3 since this season.