This problem is caused by ice blocking the defrost drain tube. I fixed mine by wrapping heavy copper wire (16 guage) around the defrost heater coil and extending the end of the wire into the drain tube about 3 inches. This directs heat into the tube and keeps the tube free of ice. I see no more water in the fridge.

The condenser area is accessed by removing the panel in the back of the refrigerator compartment (3 screws). You will find ice on the condenser coils and the drain tube will be clogged with ice. I used hair dryer to melt the ice and hot water down the tube to unclog it. Watch how hot the plactic panel gets. I overheated it and created a smell that lasted a day.

I downloaded the repair manual for the refrigerator that was helpful in removing the back panel.

This is a very common problem in Samsung refrigerators. Samsung should do a recall and do this simple repair.