Ac not cycling.

I have a 2014 Big Country with 2 15 k AC's. The bedroom unit works fine and we use it during the day mostly. The living room AC is the one giving us problems. It is set to auto and comes on fine and blows good cold air. When it reaches the set temp it shuts off as it should but the problem is as the inside temp warms on it won't start up again most times unless I shut it off manually and restart it. This sucks when you wake up in the middle of the night sweating and have to shut it down and restart it. Don't want to listen to the bedroom unit when we are trying to sleep. It's a dometic black square thermostat. Thanks in advance for any answers or help.