This is an ongoing problem, and I am sure it is me. We started with a cab over camper, went to a 5er, and now have a 29' Type B+. All were new when we bought them. In each case, I have had to defrost...
I'll be interested in reading the solutions to this problem, as my freezer does exactly the same thing. After 3-4 days, I have to turn it completely off and let the ice melt. I then absorb the 2 inches of water with a bath towel. Very inconvenient!