Our coach is 17 years old and never needed a new big boy, Richard. There is some reason for such frequent failures; either there's such a thing as "knock off" Big Boys or some other component is negatively affecting yours, as Bryan alludes to. Until you or a savvy tech ferrets that cause out, as Eric notes -and going by past Forum posts over the years- many here have resurrected their Big Boys without too much trouble.
Joel