I have a Kenmore upright frost free freezer. About once a week I find water all over my floor, but haven't been able to find the source since it only happens overnight and nothing on the freezer is wet. I poured water down the defrost drain inside the freezer without any problems (overflowed the pan accidentally, normally after finding the water on the floor the pan is less than half full). I put the freezer in a leak tray, but there is no water in the tray after finding the water. I checked the pipes above the area and nothing is leaking there and we use those pipes more often than weekly. This has been going on for close to 4 months now. So far there doesn't seem to be any problem keeping the food inside cold.