I'm with JT. Running a freezer at above freezing temperatures will cause moisture in the air inside it to freeze on the walls when the unit is running and thaw once the unit shuts off. Once the ice thaws it will run down the walls and puddle on the floor of the freezer. The effect will be much greater in a unit that has little or no content to reduce the amount of moist air present. Higher humidity increases the moisture and will increase the amount of water. Products like DampRid collect moisture from the air and can greatly reduce this effect.
I use a product called Dry-Z-Air, made for reducing the humidity in trailers and RVs that spend a lot of time sitting unused. It consists of a plastic tub with a basket suspended above it that you fill with their calcium chloride crystals. The crystals draw the moisture and, once saturated, dissolve allowing the moisture to drop into the tub. Every couple of months I empty the tub and refill the basket if needed. Refills are inexpensive and last for about 8 to 10 months.
Hope this helps.