@TechConnectify that may explain it then. I also have the fridge and freezer as separate units.
But I remember back in the day when big lumps of ice formed on the inside, and you defrosted manually when it started taking up too much room.
My freezer says it has nofrost and describes it as a technology that avoids ice being created in the first place. No idea how it works. It is an Samsung RZ32M7520WW