We have a GE ZDIS15 clear ice maker that makes a sheet of ice but does not release it to the cutting grid so the next cycle of water adds to the ice sheet. Eventually it gets so thick the flowing water spills down to the bin, the reservoir runs low on water and the pumps start making strange noises. Went through several cleaning cycles with cleaner but did not help. Starting the cleaning cycle releases the ice after a couple minutes and eventually melts through the cutting grid. Any ideas?