to update:
I'm still getting the black screen issue randomly. It appears that alt-tab or not using alt-tab to switch apps has no impact on getting the problem. I've experienced many instances where I did not switch out to another app during my play session and I still got the black screen problem. I've also experience many instances where the application exits normally even if I have frequently alt-tab to other apps.

It seems like the longer the play session, the more likely the game will go to a black screen on exit.