Ensure the bins and shelves inside the refrigerator are closed completely.
Push food items back onto the shelves so that they do not prevent the door from closing completely.
Clean the door gasket with a mild household cleaner to remove dirt and debris.
Wipe the gasket with a clean, damp cloth and dry with a towel.
Examine the gasket for signs that it is split, damaged or broken. If there are small cuts or splits in the gasket, apply a small amount of white silicon caulking, available at most hardware stores. Prop the door open and allow to dry completely.