Here is the deal, they weren't using any crazy materials that failed. The lead material has (had) well known and documented properties. Unless something was mechanically assembled wrong, which I doubt with FI, it is known what it takes to ruin them. If the rated current carrying capability wasn't exceeded then the problem was caused by a mechanical failure (over-excursion) which lowered the current carrying capability of the leads. When you get into the realm of drivers with that much stroke and that much force, you can do this. Bottom line, I honestly have not heard of that many subs failing this way. Think of how many they have delivered and have been abused without any issue. I just think it is silly to slap a % or number of failure rate on these when we know that only FI has the data to back anything like this up...