I am trying to send music tracks from my PC to my mobile phone using a USB cable to connect the two, but when attempting to "drag and drop", I keep receiving the error "Cannot Copy item - the device has either stopped responding or has been disconnected" As neither of these options is true, how can I get around this? I am locating the tracks I want to transfer by finding them on my HD and then trying to drag and drop to the phone as shown on Windows Explorer.