Model KUIC15NLTS1 under counter ice maker. When turned on, makes ice fine. After running a while, recycle pump makes loud sound but there is no water in filler tray. It's like somewhere along the way between cycles the water tray does not fill up and the recycle pump comes on but no water to recycle, causing the pump to make loud noise. If I pour a little water in the tray the pump quits making the noise and recycles the water. What would cause the machine to miss a fill cycle?