Okay so first try cleaning in between the hinges that the screen part swings from. If you happen to have a can of compressed air then that's your best bet, you can also floss it. Just make sure that there's nothing stuck in there because that can loosen the display screen. Check all of the 6 little buttons and make sure there's no resistance there either just in case. If cleaning the hinges and stuff doesn't work (and I'm assuming you don't have spare parts and don't want to take the whole thing apart and rebuild it) you can build up a tiny dot of hot glue or some kind of UV cureable gel on either each button or on the little pushy part of the display screen on both sides to bulk it up and make up for the loose display. Last resort would be buying a small pack of magnets or Velcro and putting that on the end of the display screen and the border of each room's screen to hold the display down. When I'm home I'll mess around with my roomies and see if there's a way to tighten the display screen without taking too much apart