Actually, most of the books I read are either converted from html pages (with the GrabMyBook addon) or converted in Calibre. The latest I've had the worst of time with was converted from a pdf.
At the same time I have problems with books I could open with no issue before.
I'm going to test whether it is because of the number of books. If not, I suppose it will either be because of an update problem, or some kind of hardware malfunction.
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