What is happening is the unit is going into defrost mode and defrosting the evaporator coils and the moisture is running down into the catch well but then it is not going down the little drain tube that goes to the pan under the freezer and above the compressor. What happens when it is draining properly is the heat from the evaporator evaporates the water that collects in the catch pan and this is why you dont see any water on the floor usually
What you need to do is locate the little tube where it comes out uin the back of the unit just above the catchpan over the compressor. Using a piece of stranded electrical wire about a foot and a half long clear the drain tube out by carefully inserting it up the tube..If you hit something solid it may be frozen water and whatever is plugging the hose. Use a hair dryer to heat the hose from underneath. This should allow you to clear the plug and get the unit flowing freely again.
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