<font color="blue">Ken,
We sell a good amount of those with no problems.
Check the air gap from the magnet to the wheel. Maybe jared somthing taking it out & in.
That is the only thing I have seen, outside of a burnt unit.
The P2 even has a auto shut off if you leave the key on too long.
Good luck,
Mike
P.S. If you can't fix it ...
... the car that is.
</font>