Do you have an icemaker? If so, make sure the ice cube container is seated correctly. Sometimes it can protrude a little and will prevent the door from closing properly. Hope one of the suggestions works for you.
When my refrigerator door would not close tight i had too much stuff in the door shelves. I just removed some of the things out of the door & it works great.
I've had that problem. Sometimes, just smearing vaseline all around your gasket on your door will help to seal it. We do this as the gasket dries out a little. Also, you might check down at the bottom where the door washers, etc. are, and see if that is part of the problem. I have had both of these problems and this seems to have taken care of it.
Did the floor under it shift causing the box to be off square? How about the leveling legs - did one break?
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