My 4 door bottom freezer refrigerator that is 3 years old has had ice maker problems since the first year after we purchased it. It collects ice under the freezing unit above the ice. It gets a large block of ice around the connection of the ice maker with the fan and drain piece. The ice gets small and melted and it drips water out of the door. We have defrosted multiple times but it happens faster and faster each time. We have resorted to buying bags of ice because we only get about one week of ice before the problem starts again.
I am sorry that you are experiencing these symptoms. Do you mind providing me with your full model code?
Have you tried resetting the ice maker? I have inserted a link that may also help with this