I had exactly the same thing and I had a great repairman come today that really made a lot of sense. He saw that there was some ice build up on the underside of the ice tray unit. That lead him to be suspicious about warm air getting into the unit. After undoing a couple of screws, he took out the ice tray guts and there was some ice build up on the fan. He reached inside up behind the unit and where the cold air comes in had a block of ice shutting off the cold air from getting into the unit. He took my hair drier and melted the ice. He took some kind of caulk and sealed the left hand edge of the "ice box". He then cut 1/2" off the water hose that come into the unit because the factory has cut them too long and it causes the water to spray. He then put all the guts back in and set the freezer temp from 0 down to -2 degrees. He said setting it into minus territory helps the unit to recognized when the cubes are solid enough to turn them out. Since he left the unit has been making ice and has been quiet as a mouse. Hope this helps.
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