Open your cover for the A/C inside the camper (where the filter is located).
I was having the same issue on my 2017 Wildcat and found that the metal air flow divider was not installed correctly by the factory.
The divider seperates the air flow of the return side from the air flow going to your vents.(air flow was short cycling between the two compartments)
Had to put mine in place using HVAC metalic tape as they should have done at the factory.
No problems since repairing this shoddy factory work.
I am finding this to be pretty common with Forest Rivers workmanship !!