The solenoid has a thin coiled spring in between the yoke (square actuator) and the plunger. This aids in helping the yoke drop back to the crushed position, which is down. The problem lies in the crusher bin, where the rod is located. This rod is also spring activated in back and the rod must float up and down seamlessly for it all to work.
When the freezer is too cold, or air is permeating the ice bin from the fountain, frost will prevent the rod from moving. As you can see, the rod is connected to the front of the bin, where the crushing takes place. When the dispenser calls for cubes, the yoke is raised along with the rod, which opens an ice flapper in the bin to allow the cubes to escape the crusher blades. Air coming in from a worn dispenser flapper can cause frequent jams. Inspect your dispenser and be sure your freezer is at 0 degrees, no colder.