ECM's don't kill the card, they simply corrupt the data that is stored on them, I have goldcards that I use for testing new Hex's and have reprogrammed them dozens of times, I think I once read somewhere that they can be reprogrammed up to 500 times or something like that, Suzuki, I think the ones you have must have become damaged in some way, but it wont have been caused by ECM's or by reprogramming them.