What's wrong with my Maytag frige freezer?

My side by side Maytag fridge/freezer is staying cold enough and making ice, but every once in a while the freezer side leaks about two cups of water on the floor in front, and there is leaked water on the bottom of the freezer inside that is forming a thick layer of ice. The metal coils inside the back of the freezer are slowly dripping water inside, thus the build up of ice on the bottom... What's wrong?

Robin Davila
February 2010