Unless the drain is partially plugged off you should not have any moisture in the freezer creating the musty moldy smell. I would clean out the freezer and make sure the drain is clear. If it keeps coming back you may have a crack ing the lining inside the freezer and moisture sealing in. Not a lot you can do with that unfortunately, you can try to seal it up but there are only a couple products i know about that will work in that temp and there not cheap Good luck
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