I've seen this before and strongly believe it's a Video driver related issue. I had a AMD/ATI card and had an issue just like this with a few games. I switched to Nvidia 10XX series card and didn't have the issue. Suddenly the issue came up again, then went away.
I have two monitors, so I moved the gaming window to the other monitor so when I would ALT+TAB to my desktop, the window would be open and usually not missing any frames (so I can watch the game), then open my browser and do stuff. This seemed to get rid of the black/frozen screen for me.
I hope this helps.
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Rebbon - BDA
Happy Epic Mage
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