For what it's worth, I'm seeing this problem with an MP4 player device with the same same 0525:a4a5 device ID in fedora with kernel 2.6.27.19-170.2.35.fc10.i686 and also on a different machine with kernel 2.6.27.19-78.2.30.fc9.i686.
It appears to me from watching the screen on the player that player's firmware is crashing when usb-storage does the device scan.
For what it's worth, I'm seeing this problem with an MP4 player device with the same same 0525:a4a5 device ID in fedora with kernel 2.6.27. 19-170. 2.35.fc10. i686 and also on a different machine with kernel 2.6.27. 19-78.2. 30.fc9. i686.
It appears to me from watching the screen on the player that player's firmware is crashing when usb-storage does the device scan.