I have a 185RB, and in the beginning I had nothing but problems with the refer cooling fine and then warming up so I have been down this road. Are you using the AC in the trailer? We found out that when the AC was on it would cause a vacuum inside the trailer, then over a matter of a couple of hours the AC would suck all the cold air out of the refer, but the freezer would be just fine, it was so strong of a vacuum that it would even pull the heat from the back of the refer that is supposed to be outside the trailer.
Norcold replaced the refer with an updated model. It has a reinforced door so that it can't be sucked open from the AC, they put a fan on the back of the refer then finally put insulation around the sides of the refer in the back, behind the refer.
We have had no problems since then, I can keep the refer setting on 3 and freeze meet solid in the refer, milk and pop are ice cold.
I would take it back to the deal and have them call Norcold. Keep pushing the deal if he will not help, call Norcold call Jayco tell them that you are not happy and you know of the recall.