2006 b343 with Indel cr130 refer.
Excessive frosting is usually from air leaks around refer door. If your cabinet door is attached to refer door, is it too tight - maybe from refer set further back. Else, try trapping a thin piece of paper in the door seal and pulling out. Should be some resistance all the way around. If it pulls out easily check the seal to see if flattened from age, torn or pulled loose. You may need new seal. Probably available in rv store for less than from bene.
Other possibilities - overcharged w refrigerent or rpm set too high or controls set too cold.