I have a Maytag fridge with top freezer. The model # is MTB1956DEW. Over the last week, my freezer continuously frosts up with lost of crystal ice on the back and top while at the same time the fridge section below is not staying cold at all. I really like this fridge and really don't want to have to buy another fridge. It is approx. 8 years old. Can anyone help with trying to solve this problem? Thanks.