Occasionally (randomly 20–60mins) I get a short freeze followed by the game minimising to desktop. The game sounds continue to play accurately but trying to tab back into the game, re'open, or make it show up at all it will not work. I end up having to close the app through task-manager and opening it again.

It feels like maybe something is taking focus behind the game, but nothing actually does. (this doesn't happened with other games)