Icing up in bottom of the freezer. Despite being a frost free freezer, it has now started to ice

Question

Despite being a frost free freezer, it has now started to ice up in the bottom of the freezer compartment. Starting to need a de-frost every couple of months, and the bottom freezer draw is getting stuck in all the ice and becoming unusable.Also occasionally find some water on the floor under the freezer in the morning when I come down.