I have heard stories of other guns going auto. On the Walther forum, there has been discuss recently about guns supposedly going auto. Some members who claim they thought their gun did this eventually realized it was them. According to them, the gun has a short reset, and if you quickly bring the trigger to the reset point during the recoil stage, its easy to fire it again and again and make it seem like it is auto.
I tend to fire with more time inbetween rounds, so I've never tried this.
Part of his story sounds suspect - the last part about the company president and the quote you gave. I'm not saying that because I am a P99 fan. I'd say the same thing if U were telling me about a Beretta or Sig or whatever. If the story is true, he either added more to it, or something... Souinds kinda fishy to me with the ending... But, who knows...
Any company can make some guns w/ issues.