GE Profile Freezer ultra cold and top hot

I have a a bottom freezer GE Profile I bought about 4 years ago. In the last couple weeks I have experienced the following issue:

  1. The freezer gets ultra cold with some icing. minus 15 degrees
  2. The top refrig get warm like 70 degrees

I have unplugged it for 2 days and then it all works again for a week or so. Both boxes maintain their appropriate temps… Then it starts all over again.

What is the problem? Can I repair it? I am afraid to buy anything perishable…I am getting tired of Publix chicken…

Thanks,
Frozen over in Florida