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Frost free means that the evaporator coil will not accumulate a thick layer of frost. It will not prevent frost from accumulating on the walls of the freezer. To slow down the amount of frost build up inside the freezer, do not keep the freezer door open for any longer than necessary. The freezer door seal may be defective. This would allow moisture in that would freeze on the inside walls. A heater with timed intervals to come on is one way for a frost free feature. But this will not work for frost build up on the inside walls of the freezer. It would only melt the frost and then it would refreeze again.
I've just had a similar problem. I fixed it by removing the large panel on the back of the inside of the freezer. I found a large build up of ice at the bottom of the freezer which seems to have developed because the drain hole at the bottom of the freezer was blocked. I defrosted the ice, cleared the drain and now the freezer is working fine.
Frost Free Freezer have an automatic defrost, which is essentially a heating element which melts any ice. If your door seals are in poor condition or something is preventing the door from sealing the ambient air may be melting the ice more than the drain can accommodate. Check the drain in the bottom of the freezer. Humidity can also cause more water to accumulate, especially if the door seals are not sealing.
Frost free fidges are supposed to stay frost free because the automatically defrost regularly. When they do this they may drain water down to the bottom of your fridge. Look for a tray that catches this water underneath the unit. Make sure yo keep it emptied. If you live in a very warm climate you may be getting a lot of humidity inside. There may be a switch that you can change for lower moisture.
I'm not sure if this will help but the freezer that is located on the bottom of my refrigerator started forming ice on the back part where the cold air was supposed to be coming out. I kept hearing a hissing sound like water dripping on a hot surface. I called the repair man in and he had to replace the defrost timer. Once he did that it worked like a charm.
I am not an expert by any means although removing ice from a frost-free freezer is a pain and this took care of the problem for me. Good luck!
Although you say the seal is fine, this is almost certainly due to air getting in.
With the door closed check that there isn't a tiny gap with a strip of thin card or plastic.
Of course if air is getting in then it must also be getting out somewhere else so probe all around the seal.