The lock cylinder has a defective design, and new replacement ones will
continually fail as well.
After my warranty ran out, and it stuck for the 4th time, I took it apart myself.
The tumblers to not act directly to lock the cylinder, but push slightly on a
locking bar at 90 degrees from the tumblers, to nudge it into the correct
But this really relies only on the weak tumbler springs, and the locking bar can
easily get stuck.
That is why tapping on the cylinder when the key is in, will often free the
stuck locking bar.
But the whole design is fatally flawed.
The only solution for now is to remove the tumblers from the cylinder, so that
the locking bar will not ever have to move at all.
But don't worry, you still need the key to work the transponder, so no one can