Ice maker not dumping as frequently and cubes freezing one large chunk
The first thing I would check is the cleanliness of the condenser coil under the fridge. Make sure the fan under there is running, and that the coil is clear of dust. The ice maker requires 15 degrees for a period of time before it will make ice and dump. If the temp in the freezer is colder than this, then it is likely the ice maker needs replaced. They can be replaced fairly easily with just a couple tools. (1/4" nut driver and a flat screw driver). There is a plug where it plugs into the freezer side wall, and a bent tube that supplies water to the tray. If not sure what to do, have a service tech look at it.