Intermittent Warming on GE side by side. I need help trying to solve this problem.I have a GE side

Question

I need help trying to solve this problem.I have a GE side by side refrigerator/freezer. Every two weeks, therefrigerator side becomes warm (60 degrees) . I defrost the machine,and both sides work for two weeks. I have done this three different timesand it's the same thing......works to two weeks, gets warm, I defrost it,works again---for two weeks.