I’ve noticed that if you alt-tab out of the game right when a loading screen completes (and possibly when the game exits), the game will freeze, stop rendering (screen turns black) and then stays locked for a decent amount of time. When it happened when I exited, it never stopped. I tried to use the task manager but that locked up as well.
I don’t think this is a system issue (I have plenty of RAM, 8GB) and my system is terribly underpowered. Let me know.