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My girlfriend and I both have Kobo Voxs, and mine operates fine. Her's, though, exhibits the strange behaviour of periodically convincing itself that purchased books are, in fact, unpurchased previews. She's often partway through a book when this happens. She's forced to delete the book and redownload it, or other tricks she's learned to get the Vox to recognise it as a purchased book.

Any ideas on what's causing the problem?