Thanks for the tips guys... No, I don't really think slightly exceeding 65MPH is the cause. My only point is air pressure was fine when I left (sure it could have dropped on the road), and Im definitely under weight for axles and tires. I've been meaning to replace the china bombs.. was going to do it this year, but thought I'd get another year.. Oh well.
Apparently there is a reset button on some models of Dometics. The button apparently trips when the temp behind the fridge gets excessive. Have read several cases of this on the inter-web. When that happens, apparently Err3 comes up. Will see when I get home this evening and check it out. It was running fine on gas when we stopped for lunch. When I got home, I connected up to electric, but honestly did not go into the camper and check it at that point.
Honestly I've been thinking of switching to residential fridge for awhile now. If the fridge ends up being replaced, I was thinking just that.. replace under the warranty and then swap it.. sell the RV fridge after removed. We shall see.
Thanks
Mike