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that is very peculiar. i would have said it is a problem with unsupported special characters (accents or other alphabets, like greek) missing from the font, but clearly if the letters come back later this is not the case. have you noticed if this happens more on specific books than others ? have you tried redownloading the books to be sure they're not corrupted ? have you tried putting the books in the main memory (if they're on the memory card) or on the memory card (if they're on the main memory) ?
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