This is generally a sign of a corrupt book file. Do another Factory Reset - does it still crash without any books on it? If it does, you need to contact Kindle Customer Service.
If it's stable without any books on it, re-add your books a few at a time, letting indexing of each batch complete before adding the next. You'll probably find that adding one batch of books will make it crash. Remove that batch and re-add the books one at a time until you find which one is causing the problem.
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