I have downloaded almost 4 gig of music on a 8 gig SD micro card and put it in my Instinct.  The player is not reading the music on the card though, it only plays what I have downloaded from the Sprint store directly to the phone. I know the card is found by the Instinct because when I check the memory button it shows me what's on the phone and what's on the card.  Any ideas why it will not play what's on the card?