The problem is that the factory drain kit gets gunked up and cannot drain the water created when the unit automatically goes through its defrost cycle.
Whirlpool fridge p trap drain tube kit.
This kit eliminates the self closing valve and replaces it with an open p trap style drain the kind used in every sink and toilet drain in your house.
Obviously there s a design problem with this model since many other people have the same issue.
The function of the p trap drain kit is to carry the water that has formed during the defrost cycle to the bottom of the refrigerator where your drain pan is located.
The p trap drain tube kit may also be known as the duck bill or the drain pipe.
The drain tube for for the defrost cycle seemed to be blocked so i googled the repair it sent me to appliancepartspros.
Seems this is a common problem with many refrigerators.