Hi my name is ***** ***** first thing to check is that the actually ice shoot is shutting tight. If there is any leakage of air into the freezer the water contained within the warm air will freeze up the ice maker mechanism and as time goes on get worse as the shoot freezes open and more air get inside.
The only other thing here is that there is a heater in the ice maker that switches on during the dump sequence to allow the ice to drop out of the slots. This may be the problem. Best way to check is find the operating button under the ice maker, press it and the icemaker will got into automatic test sequence which includes an ice dump and refill so you should be able to see if there is a problem.