It may be a file issue. Sometime when uploading files a file will duplicate itself with a unrecognized file ending. I had a similar issue. My reader kept restarting. At first I reset the device, of course it didn't work. Then I plugged it into the computer the 1st attempt it didn't register. (About this time it was restarting for about 2 hours.) 3rd attempt (just before it restarted) I was able to see my files. This morning I uploaded some music. The new set had a file ending in mp3.TMP. Deleted the imposter, disaster averted.
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