Speaking from personal experience, It sounds like the cooling unit is damaged and needs to be replaced. If you intend to continue to use it as it is, be certain you have the over-temp safety device installed. This was a retrofit from Norcold a few years ago to prevent the fridge from catching fire, which it can do in an overheating situation. Again, from personal experience, Replacing the cooling unit is an expensive proposition, and it is well worth considering the installation of a residential frig instead. your choice.