I'm having this problem as well. When I first got the phone I just slotted in the memory card from my old phone and everything was fine. Thursday, I picked up a brand new 32gb card... and the phone is all over the place: tried copying and pasting with the card in a reader -fail, everything moved to LOST.dir; used MediaGo - fail, tracks either disappear, play too fast, or I get a 'cannot play file' message. This is abysmal. I bought this phone for the camera (excellent) and the Walkman tag. Right now I wish I'd picked up the GS5. As a media player it's not fit for purpose.
... View more