ice maker goes nuts

[Fritz]

10yo Thermador KBUDT4270A02.  Over night, the ice make went nuts and filled up to the point where the container was popped out of the dispenser.

We had briefly used crushed ice the night before from it's normal setting of cubes.  Doesn't seem to be any ice dams in the freezer otherwise.

I removed the dispenser part and it was frosted over of the non-active interior.  Washed it clean and shut off the ice maker for the time being.

[Fritz]

just emptied the overflow pan again. Full yesterday, it was about 1/3 full in a day or so.
The ice dispenser motor turns as does the auger, by hand.
But when the door is closed to allow function (though empty of ice) the auger doesn't move.
I wonder if any of this bears on what has the previous?

[Fritz]

fixed ice maker.  there were some crystals in the bottom coupling.  But still concerned about the overflow pan fill time.  Is there a norm for an unairconditioned house over x hours?