Hi, my magic chef beverage cooler can cool but won't. It occasionally cooled then went up to room temp and hangs there. I replaced the start relay and overload circuit. Then it worked fine for a week. Compressor came on; fan pushed warm air. Then it went back to intermittent cooling. Now, it will cool if i smack it or fiddle with the thermostat. But then it goes back up to room temp and hangs there until I come around again and fiddle with it. this is driving me nuts. I'm grateful for any help.