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Do you have a load shed device on this? 30 amp cord (3 prongs) or 50 amp cord (4 prongs) and are you using any kind of adapter on the cord?
Any adapter being used on the cord or are you plugged into a 50 amp outlet? Do you have a load shed system?
Did he check the dip switch settings on the control module to be sure they were set correctly?
Do you have one battery or two? Any fluorescent lighting?
This should have at least two batteries. Most dealers are too cheap to properly outfit these and want to save money. This may have been caused by low voltage due to you having a lot of uses on at the time. Larger 5th wheels, especially with multiple sliderooms take a lot of power. One battery just won't get the job done and when you move the rooms in or out it can drain the battery quickly. So can other uses, especially if this is just a 24 series battery. It should have two 27 series batteries connected in parallel for best results. Other things that can cause this are a bad connection at the thermostat OR at the control due to moisture in the air. Usually you see an E1 fault on the controller and it won't just shut down, but it can or just shut off one zone. OR it may be a defective thermostat or controller. Those would be under warranty. So, I would get the battery situation upgraded and then see if this corrects it or if you have it happen again, some new parts would be needed I suspect. Hope this helps here. Please get back to me if you need additional input on this as all follow ups are included in our fee.
Just checking back in to see if you were able to resolve this or do you still need some additional input from me here?