Water is collecting beneath the right crisper bin.
Model FRT21G4BW3 20.5 cubic ft. top mount, purchased 2002. Never a problem, never changed settings. Freezer dial at center point ("recommended setting"), refrigerator at 3. Door seals are intact. About once every 24 hrs., we notice considerable water beneath the right side crisper bin. If we forget to check, it fills the left side as well, and ultimately leaks out to the floor.