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I've no idea if there is any kind of known issue, but if you don't store all your books on your Kindle, I'd try deleting everything any books on it, do a hard reset (press and hold power for 15-20 seconds) and then try loading your books on again (in small batches to let them index between adding more).
Edited to add: if that doesn't work then you could try the factory reset, but I wouldn't do that straight away.
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