Super Moderator "Loose Nut"
It appeared that the axle nut holding the ujoint yoke to the output shaft was not correctly touqued from the factory. The nut would loosen up and cause havoc. There were enough that had this issue that it's recommended to properly touque the nut then strike it. It's a very expensive and major repair. That's why the fix listed above is a very good repair that lasts for years.I'm still puzzled by this being an issue with the XVS1100, but hardly every heard about on the XV1100, which have the same set-up.