some of the samsung built twin cool model units have dual evaporator systems one in the freezer and one in the refrigerator, if the defrost drain on the one in the refrigerator section gets stopped up it will overflow and back water up into the refrigerator compartment when it goes into defrost mode.
Below is a video that will show you how to remove the panel to get to the defrost drain, once you get the panel off you will see at the bottom of the evaporator a metal plate and it will have a hole in it that is the drain you will need to unstop using a air hose or wire or a hollow tube that you can stick in the hole and blow in:
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