Check out the rubber ring ( or called door seal) to see if there is black mold build up inside the bottom rubble.( b8 ]# e$ T9 K; C0 T3 F7 E
$ _/ P0 H: |7 j. 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.