A dead battery can cause file deletion, it's happened to me a few times too on my old player.
When the battery is too weak to boot the player it keeps restarting, and this breaks the formatting of the flash memory. The only way to fix this is to turn the player off by the switch when the battery runs down.
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For my dreams i hold my life...
I miss my Meizu M6SL... Currently rocking a Sony Ericsson w595 on Samsung in-ear phones. Does fine, but it's not a chipod... 
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