Locked in blade
My old Cuisinart has this problem because the motor shaft and the corresponding socket on the cutter are worn. The shaft has jammed in the cutter. To un-jam it, stick a bar of wood behind one blade of the cutter (I use the wood handle of my dough whisk) and give it a light, sharp tap with a hammer. Check after every tap to see if it is loose, if not do it again. You want to tap against the back side of the cutter, not the cutting edge side. The socket on your cutter may be cracked, allowing it to open up and slip (and jam) under the stress of cutting. You'll probably need a new one. If the motor shaft is also worn, that can also be replaced. The new part is about $10. I got a few more months of life from my cutter by reinforcing the inner socket with a thin plastic tube from the barrel of a syringe.
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