I have a problem when I want to connect my Clip to a portable radio. I use the USB-port on the radio, and this works fine. However, after a couple of minutes the connection gets cut off and the music stops. The radio is still on, the Clip itself is still on, but I have to reconnect the cable to get the connection up again. I have tried to switch the Auto-power off, but to no avail. Is it just impossible for the Clip to stay connected, or is this a production error?