Ice makers wear out after time. Some times all they need are removed defrosted and ensure the water feeder tube not frozen and plugged up.
Not that hard to replace them, two screws and harness transfer most cases. Now if you have bottom freezer with the ice maker down there it's a lot harder. There also shut off valve in the back where the water hose connects rarely they fail, usually it's the gears in the ice maker or water line at the ice maker plugged with frozen ice.
Most don't clean out under refrigerator's. They slowly plug up with dust, over heat, and won't cool which causes the compressor to die. If you own pets it especially important to clean the coils and fan area due to extra buIld up with pet hair. Usually this requires removing the back cover using feather duster or compressed air to get air flowing again.
When I moved in the refrigerator coils and fan hadn't been cleaned out for long time. It ran all the time, didn't really cool good and made noises. I cleaned coils defrosted it and it ran little while longer, but the compressor was on its last leg and wasn't worth replacing due to the cost. It's also important that you have enough room for the air to circulate leaving few inches from the back wall if possible.
Do routine maintenance and most will last long time.
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