I can almost guarantee he froze it up. Small room, turbo cool. There is nothing wrong with the AC, but the room is damp, and the AC can't run all the time like that very well.
I would recommend at a minimum putting a small fan in front of the evaporator, and try not to chill the room to 50 degrees. The best fan, by the way, would be an oscillating one, but any fan blowing on the front of the AC unit in the room, will reduce the TURBO FREEZE!