I look at owning a camper just like owning a house, something always goes wrong. Don't get frustrasted, things will get better. Back in 2005, DW and I bought our first P/U, at the dealer check with us the everything worked fine, turned on the fridge a few days later to go camping and it did not work. Took it in to the dealer and they showed me where all the tubes on the condenser had turned green, had a refrigerant leak. They changed out the fridge and all was good. You probably know this but these fridges need to be pretty well level to work well and they can overheat because the ventilation is not that good. I put a small exhaust fan on my unit to help remove some of the heat build up and they do work good if you get them in the wrong spot. Something to think about. Hope things for you go better and you find your problem.
2016 Forest River Surveyor 201RBS
2014 Chevy Silverado 1500 4.3L