If the magnetic door seals are not damaged you probably need to check and reset door alignment.
(A) Empty contents.
(B) Slacken the upper and lower hinge bracket screws which will allow the door alignment to be set square.
(C) Tighten slightly and recheck, re-adjusting if need be. It's a bit awkward because you usually have to open the door to get at the screws and the door slips out of true if they're too lose.
I find it's easier to do with fridge resting on its back with door uppermost - BUT protect the radiator coils from damage.
John Wilkinson, August 2009