The symptoms suggest there is a bad book in the batch being processed. Unfortunately, if the firmware fails to process a book, it stops further processing and either reboots or goes to the home screen. And it will keep doing this until the bad book is removed. The only fix is to find the bad book and remove it. Unfortunately, I know of no way to find the bad book other than trial and error. You will probably need to remove them all and add them in smaller batches until you work out which is the problem book.
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