My garage a/c unit has done this twice now. It will cut in and out, an E1 code will show on the t- stat display and both a/c units will them shut off. After an hour or so they will work again. I had a tech look at it and they could not find anything. I have never had a problem with the main unit. It only happens when the garage ac is running. I agree it is frustrating when it is 90+ degrees and you ac shuts off for an unknown reason. I have a 2013 3200.
2013 Voltage 3200 with 17.5 wheels and disc brakes towed by a 2014 Ram CTD 3500 SRW crew cab short bed