the frost may be melting and draining outside of the drip tray.thus laying on the bottom of the fridge and migrating to under there via the door...possibly at the hinged corner. put a towel under the crisper drawer ,see if it gets wet. if that is the reason , add some foil to the front of the drip tray under the fins to extend out abit further.(had to do that on mine.)
or the drip tray is not pushed in far enough to contact the small drain hose behind it...
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper