The problem is that I can't reproduce this on any device with any sd card. So this is not a sd card + player + device issue, there is the 4th factor. I will try to find it, suspects are: - heavily fragmented or otherwise very slow sd card (though I can't reproduce on class 4 sdcard) - some concurrent sd card I/O (on some Android firmwares / file systems the access to sdcard is strictly queued and no parallel access is possible) - e.g. after some tracks are uploaded to the device and very