So I have this problem as well. It has happened about five or six times at least.
My analysis is this. There is a chute to the left of the auger that allows ice to build up, upwards above the where the auger drops it into the chute. This is always caked up when it is frozen.
My theory is the following:
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The auger can toss/grind ice faster than it can fall down the chute into the glass and this void above the chute is designed as a backup (ice is pushed up there)
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The door at the bottom of the chute has a “soft close”, it does not snap shut
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if a cube is sitting in just he right spot, the door will be propped open allowing warm air up the chute to where the ice is backed up causing it to melt and re-freeze
In order to get it melted and freed up, I have to pull out all the ice and melt the dam that is in the auger, which is a pain in the arse.
I have a new strategy I am thinking of trying. I am going to get some heat tape (like they use in heated winter gloves) and affix it to the outside of the chute area that freezes up (under the shroud it sits on) leaving a battery connector accessible from outside the chute. When it freezes up I am going to plug it in and let the glove warmers heat up the outside of the chute so that it loosens up a bit and the clog can fall out and the auger turn.