Check out the rubber ring ( or called door seal) to see if there is black mold build up inside the bottom rubble.$ C! t- d6 \ \# e1 x
% R5 j- A4 n* m8 V2 h$ r( s/ k* 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.