yes, there's very likely some funny wind currents taht affect these things... back drafting and the like... while driving. It could be just the controller not functioning "correctly" because of them... but I can believe it possible the the fridge operates out of acceptable range just due to wind currents, crosswinds, "blocakages", etc.....
side track, but did you find the solution to your problem? Yes, 3 days is a problem.... well I don't know about in extreme desert temps, but generally that seems like a problem... mine cools down "enough" in just a few hours.... and very well just over night.
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