My Sandisk MP3 suddenly wont play certain tracks

My Sandisk MP 3 Player suddently wnt play certain tracks.  I get a message saying “Synchronize your music subscripton to continue”.  I am really puzzled would apprecate some help.  Thank you.  Up to yesterday it was working just fine!  I do have a lot of tracks the additional memory card.  Thank you.

  1. You posted in the Users Guide | Firmware | Software board where your post is not likely to be seen by very many as it is of-topic.

  2. Reading this SanDisk KnowledgeBase article on the subject may help.