Hmm, if you could recover your files then it ain't hacked.
It's most likely a bad flash chip, or crappy firmware messing up your file allocation table. Try reformatting it, use FAT (not FAT32) and see if it happens again.
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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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