A few comments & suggestions:
1.Scan the Clip Sport internal memory and micro SD card for errors.
http://www.thewindowsclub.com/disk-error-checking-windows-8
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Do not use NTFS format for the internal or external memory.
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Use FAT32 format for the micro SD card. (No larger than 32 gb).
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Try the player’s System Settings Format command for the internal memory (as a last resort).
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Make sure you use the Windows Eject Command after you finish a session with Fat Sorter (and after all file management sessions),