If you mean the food products are themselves freezing and they are not too close to the fins on the evaporator; the the relay that controls the heating element is probably stuck. You could try accessing the control board and tapping on the relay with the butt end of a screwdriver to see if you can break the weld of the points in side. If not, then a new control board would be in order.
If the food product is not freezing up but the evaporator fins are; this is normal in humid climates via opening of door. Make certain the doors are closing properly and check the drain tube for the plug that hold a vapor barrier and keeping hot humid air out.
Let us know what you find. Good luck.
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Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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