Recently while watching various movie's on full screen on my window 10 media pc running both plex server and theatre sometimes the screen randomly minimises , it had done this in the past when an update comes in for windows an/or apple itunes, so I have switched the update to ask permission before installing , this was fine then recently this has reappeared. We may watch 2 films with no problems then on a third it suddenly minimises during the film. It is not a particular film as it seems to be very random. Any help/advice??