I’m new to full time rv’ing and am using my roof a/c for the first time. Yesterday it ran ok, although I didn’t think it was terribly efficient. Today I turned on the LR unit and it ran a few minutes before it started randomly turning on and off. It wasn’t because the set temperature was reached. Its obvious that it has some sort of problem. I turned it off as soon as I realized it was having issues so as to not cause further damage. I’m wondering if anyone has an idea of what the problem might be or can tell me if there’s something I can check on my own before calling a repairman. Its a Dometic but I don’t know the model or even where to find that information. The 5th wheel is a 2013 M-3585RL Bighorn. I’m also considering just getting some type of room a/c. Some are reasonably priced but I haven’t gotten as far as reading any reviews. Does anyone have a recommendation? Thanks for your help.