Most of the time when we use the "cubed" setting on the ice dispenser it makes a loud grating noise. I've already called GE and according to the "secret manual" that they could not send me that's considered "normal" ??? I think they are just to lazy to come out and fix it but... I've tried everything I can think of - realigning the teeth in the back to assure it is catching, replaced the water filter just in case, made sure the cubes weren't frozen solid, etc.... It happens 95% of the time - no matter the time of day. The lady at GE suggested it'll happen sometimes depending on what cycle the freezer is in but it happens all the time.
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