The first thing I'd check is the seal. They only last so long & if they get any crud on them or disintegrate or tear, it will cost you money by the fridge constantly running. The second thing I'd mention is to make sure your freezer is full. If not then you'll need to fill up old milk or juice jugs with water & freeze them so they turn to ice. They talk about this trick on the TV all the time because a full freezer stays cold longer & is more efficient than an empty one. Thirdly, it may be your freon gas (or whatever they use these days) is running out so the motor keeps running to compensate. As far as the motor itself, I wish I could offer you more help.
PS. Another thing you may want to try is vacuuming off the back of the fridge to clean the coils. Thy need to be clean or they won't work efficiently.
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