Check out the rubber ring ( or called door seal) to see if there is black mold build up inside the bottom rubble. 1 W0 J+ U& S* s! {1 o; P - w u) c9 Q7 i: m+ X/ ], G% tIf it does have mold and can not be wipe out, then you have to change out the whole seal.. I bought a new seal and changed out few weeks ago.