Check out the rubber ring ( or called door seal) to see if there is black mold build up inside the bottom rubble. : @: k+ P! Q& V) q , s, t) Q7 j2 q/ ^8 v% p! i6 KIf 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.