Not doubting that you are having problems with the cartridge misfiring but how does it not hit the blade? I would think that there is something else badly wrong if the cartridge fires but does not touch the blade. OR are you saying that there was no contact with the blade to cause a misfire.
I have not seen any complaints about the Saw Stop other than from the ones that will not buy the saw. I do monitor this group on an almost daily basis.