If your ice maker keeps freezing up, it could be due to a faulty water inlet valve. The valve could be letting a trickle of water flow inside the line and into the tube, causing the water to freeze up inside the line or tube. Try to thaw the water fill tube or line. Test the water inlet valve using a multimeter and replace, especially if this problem is reoccurring.
Find a replacement Refrigerator Water Inlet Valve for your Refrigerator.