Just restrung my P bass with a fresh set of D'addario Chromes (my string of choice), a task I have done a number of times before. As I was tuning them back up to pitch I noticed immediately that my A string sounded strange. Almost a buzzing static kind of sound, something I had never heard before. Then I realized that the outer wrap of the string seems to be completely detached from the core. Has this happened to others? I would assume this is something a reputable music store would return?