I have a V500 that I purchased refubished in January. The 35mm mask broke in one place pretty quickly, though it's still useable. Last week it inexplicably died and through some combination of driver reinstalls, repeated restarts, switching USB ports, and calling upon the dark spirit of Zuul, it came back to life, and has since successfully scanned 3 or 4 rolls. So I guess I'm saying, I don't know what?