Originally Posted by ogg

I don't know why there are so many posts implying that the problem is tied to a specific card used and that having a backup card is helpful. It's not. If a card doesn't process on a swipe, it is no more or less likely to process on a second try than any other card you own. The failure to process is random and has nothing to do with the Simon card used. (There can be defective cards in a batch, of course, but this 05 problem is not that.)