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When one door is closed, there is a pressure increase that causes the other door to open. That excess pressure is designed to be released through the defrost drain hole. I suspect that drain hole is plugged. Open the doors and unplug the refrigerator for 24 hours to allow a full thaw of all the air paths in between the walls and you should have no more trouble with it.
If a door was accidentally left open, even one time, it will draw air and freeze up. It may be out of position, too, from the factory and plugged.