My meat and cheese drawer has a sliding control to adjust the temerpatrue in the drawer. Well the sliding control has ice back behind it and is frozen so it can not open or close. This has been causing the food freeze. I took a hair dryer to it a few months ago and cleared the ice out but it has frozen again. Now I am getting water in the refigerator - pooling under the bottom crisper drawer. Any ideas as to what is causing this?