i had this problem The reason was
at the rear of the ice tray is a plastic part that cliks the ice out when it turns fully round twisting the tray causing the ice to fall this part brakes of if you remove the box you will plobably find it in the ice this is a link for a new one hope this helps .
http://www.buyspares.co.uk/ice-maker-assy/product.pl?pid=1226846&query=5045172172563
Fred
December 2010