In your subject you've specified REFRIGERATOR, so if it's a refrigerator and not a freezer, the problem can be with condenser coil underneath the fridge. If you haven't cleaned it up in a while, it is the absolute problem. So just check it and get it cleaned with a vacuum. Me and a friend of mine, both have
whirlpool refrigerators and we both got rid of this problem with the same solution.
Don't have much knowledge about freezers but yes, in case of refrigerators it does work.
Good luck.