Dometic Automatic Refrigerator Temperature Control

Replaced my thermistor with the snip-the-tip and I still have the same problem (sometimes). When the motor home is parked in the yard I've run the refrigerator for days on gas or electric and it holds rock steady. As soon as I travel it starts freezing stuff again. Could it be that when the coach isn't level for sometime that the unit goes on constant run? Do I have to replace the circut board?