This is very unusual. Are both units exactly the same? If they are then this may be a manufacturers defect that the company is not yet aware of.
If the unit does not have sufficient insulation around the freezer unit then the warmer air outside of the unit will condense the moisture it contains on the cooler surface of the freezer. The moisture then drips down onto your floor.
I suggest that you call the people you did last time and advise them that this is occuring again. As I said before it may be a manufacturers defect that they just are not aware of yet.
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