The drain from the evaporator is clogged/frozen. This is the drain that carries the water that is produced from your fridge defrosting itself at least once a day. Remove the back wall inside the freezer - you'll see the cooling coil , directly below it is a trough , in the center of the trough is a hole which connects to the drain tube. Use a hair dryer to thaw the ice , then use a turkey baster and using really hot water keeping blasting and sucking water down into this hole until it flows freely. If your satisfied with this answer please hit the ACCEPT button. thanks for using justanswer.