Is ice or food blocking the vents in your freezer? Anything that blocks the vents could keep the air from circulating ...
You probably rely on the freezer to save foods from spoiling like excess steak that you bought when it was on sale or a ...
This also keeps fridge and freezer smells separate (and ice untainted). Lastly, Sub-Zero thoroughly tests every single unit before it's shipped as opposed to a few units out of thousands ...