Check out the rubber ring ( or called door seal) to see if there is black mold build up inside the bottom rubble. . W5 q+ s) z2 N6 m* C% S5 s: C8 x; a z! d7 }% [' T) K
If 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.