Dometic AC Issues

Our is a Coleman unit, but does the same thing. Mine is a little over 4 years old and the first two years or so everything was fine, but then the A/C would cut out, and sometimes the thermostat itself would go blank too. Sometimes you could just reset the temp and it would kick right back on, other times the thermostat was dead. It is hard wired so not a battery issue. I pulled the unit off the wall and the wires going into the thermostat were all corroded, so I cut them back to clean wire and reinstalled. It still did the same thing. I have a new thermostat on order. I'm thinking in my case the corrosion on the wires leads to shorting connections within the thermostat itself. It has done this at numerous different sites over the past two years, so I rules out low voltage. Also, sometimes I can get it back to life by wiggling the thermostat around, tapping it, generally abusing it. . . so that's where mine is if that helps.