Refrigerator has water leak. our side by side refrigerator has started to leak water. I closed the

Question

our side by side refrigerator has started to leak water. I closed the shutoff valve for the icemaker but it still does it. About a cup (maybe Less) of water pools up on the freezer side bottom and then drips out on to the floor. It started this weekend, has happened 3 times, roughly 12 hours apart. I'm wondering if this has something to do with the automatic defrost but I find no tray underneath. Any ideas? Thanks Rick