Check out the rubber ring ( or called door seal) to see if there is black mold build up inside the bottom rubble. 8 D0 J u0 L3 h; K. ^1 y8 Z' _ 8 \ D+ d/ e; ~& 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.