I noticed puddle of water on the floor underneath the freezer so checking where it is coming from I noticed a build up of ice at the back of the freezer at the bottom and realised the water was coming from that. Has anyone had this problem and is there a solution

I see several posts here about that, even the same maker.

But here's one quote that might help:
I have a kenmore side by side and I had ice build up on the lower bottem back wall. I went onto the web site Appliance Parts from RepairClinic.com - HomePage and they really helped me a lot. I have to replace the defrost time. It tells you everything you want to know.