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I have had this trouble with almost every Kobo device I've used, and the only thing that has solved the problem for me was to restart the device, hook it up with the USB cable to my PC, and delete any recently added PDF files. It seems I've had a few corrupted PDFs in my Calibre database, and they caused the device to stop importing (often, but not always at 6%), and then the device reboots, and the most recently added files are not in the "My Books" listing.
It has *always* been a PDF in my experience. Good luck!
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