I'm wondering whether the failure of the 370Z's steering lock unit might related to the solenoid pin being held too tightly because owners' have the front wheels turned to the side and there is additional pressure against the pin? With a key ignition this situation is clearly present when you try to turn the key—on a steering column lock—and you can't until you have pulled the steering in the direction that relieves the pressure on the pin. In the 370Z one takes it for granted that the pin will simply release itself. When the pin is held, it is surely not good on the pin's solenoid and could accelerate failure as the solenoid remains activated trying to dislodge the pin.
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