Sounds like the evaporator coil (the section that cools the air into the coach) is icing up a bit. I had this happen on my coach just once...look for a blocked drain or a partially blocked air passage. Does your rig have ceilings ducts, or just the vent at the AC unit?
When you rested the unit for a few hours, the ice melted away and then the AC worked as it should when you ran it again later.
Chuck
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2007 Tour Master T40C
Acura MDX toad
"It takes a great deal of time to recover from any improvement..."
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