you have a stopped up defrost drain causing the water to back up and drain into the fridge.
every 8-12 hours your refrigerator goes into a defrost cycle to melt the ice off the evaporator coils, then the water goes down the defrost drain tube to the defrost pan under the fridge, if the tube gets stopped up it will cause the water to back up into the fridge. The drain will have to be cleaned out.
here is a video that will explain how to do that
once you get the back panel of the freezer out under the evaporator coils you will see a metal plate with a hole in it that the water should be draining down you can blow that out with an air hose or use a larger gauge wire to push down through there to try and unstop it.
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