Refrigerator fixed after 3 long years

I have a similar problem with my Norcold. But it worked fine until just this trip to Florida. It was working good till about Arkansas (just when we really needed it) then it would only work while parked. I checked for vent blockage but everything looked fine. It's in a slide out so it has the same venting yours does. And in my case, if it's turbulence why would it work for a year and a half and all of a sudden have a problem now? The burner still runs and there is no fault codes on the front readout. It just stops working. The freezer still seems cold but hard to tell packed with frozen food and ice. On a side note it's the first time we used it in very high humidity. 33C/90F The trailer is 1.5 years old.