Mine has been doing the same thing and foound it was the pump cavitating (dry). What caused it on my unit is there was buildup of minerals on the sides of the freezer plate so the ice slab wouldn't slide all of the way down onto the grid. When the unit would start the next cycle the water would ramp up over the stuck slab and down into the ice bin and then the pump would start making the noise. A related problem could be the cutter grid not heating so the slabs back up and results in the same issue. Look up into the freezer plate next time it makes the noise and see if there is a slab partially stuck.
Your water is too hard. Mine did this for weeks and Ge replaced every part on it. The solution was a RO water system for the ice maker. Problem solved and has produced great ice ever since.
If it's that loud then you should replace it. :)
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