Obviously, something's not right here. I don't know what's wrong with your speakers, but I doubt they are going bad due to some type of quality issue. Something else is causing them to fail. It would probably help to list your system. Also, I assume that your dealer was out to have a look at your system. I'm pretty sure its required that the dealer does the initial install on a pair of 5's. Maybe your dealer can let you borrow some good surge protectors for a while. They won't protect against lightning strikes, but I think you can rule that out. I doubt your house got hit by lightning 6 times. You could have power surges. Do any of your neighbours have problems?