That sounds very perplexing, Pomtroll. Maybe a few more details might make it easier for someone to help you. How did you create the collection and add books? Was it manually on your ereader? By syncing with the Sony software? By calibre using tags? When the collection disappears can you think of anything you may have done recently before it happens? Like maybe connect it via USB and transfer more books to it or something like that?
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