Im sure they were a bad set as ive never replaced a set in 30 years but they had gone and the rear sprocket carrier was loose , wobbled and threw my chain cranked over a left hander !! Eeeeek ..
Was a build date of sep 2014 so please check yours .
That's a pretty significant piece to fail. In over forty years of riding countless bikes I have checked many cush drives with upwards or thirty thousand miles on them and never seen a failure.I think I would be back at the dealer with blood in my eyes if the crappy parts caused the bike to throw the chain!