Check out the rubber ring ( or called door seal) to see if there is black mold build up inside the bottom rubble. . p' t# `- W0 N4 F4 r D1 C! s : c- v) X, @9 W$ @$ t1 oIf 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.