I see the problem.
And I get the same sometimes.
I use Dual Monitor in my pc, and by mistake some keys or function is activate.
Samples:
F5, Ctrl+F5, Backspace, Alt+F4 and others.
Plus all navigations buttons or shortcuts.
I suggest on that cases a auto pause in game and a message box with confirmation to leave HF page. Sure, only when a game is playing.
I think it's maybe fix that issue.
