I believe the key is to have the 7.5v "buffered" boards. If I remember correctly, JJP replaced the original non-buffered 5v boards with non-buffered 7.5v boards. They were an improvement but still had problems. JJP then released 7.5v buffered boards that eliminated most of the problems. At the time, JJP was also asking owners to send in the "bad" 5v boards when they were being replaced with the 7.5v buffered boards. I could be wrong, but I think JJP then refurbished many of the original 5v non-buffered boards into 5v buffered boards which have proven to be as reliable as the 7.5v buffered boards. At least that has been my experience with my early-build WOZECLE which now has all 5v buffered boards (replaced under warranty) and has been reliable ever since.