It's behaving as though it is icing up. I don't know what the cause might be however. Dirt on cooling fins, refrigerant pressure too high or low? These are things that a qualified A/C tech should determine.
Perhaps you have the thermostat set too low? (or it is defective?) I wouldn't hesitate to request repair.
Is your unit a Domitec? They seem to be a great company. If you don't wish to go to your RV dealership for A/C repair, Dometic can guide you to other authorized A/C service centers for their warantee repairs.
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