I'm sorry to hear this. I recommend letting a service technician have a look. Send your full model code and serial number via private message or call 1-800-SAMSUNG directly to get started.
How old is it? There should be a pen under the fridge that might need to be emptied. And the area under and behind the fridge might need some cleaning. I just had this issue with a different brand refrigerator. Cleaning the coils solved it.