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I've seen that with a couple of books. The main issues with them were structural such as placing the entire text content into a single file, and CSS & formatting errors such that when I opened the book and ran epubcheck on it, there were multiple pages of errors reported. In your case, I would suspect that your Libra 2 has added books so the database is taking up more memory leading to out of memory errors when opening your NIV Bible.
Have you reported the book to Kobo? The few times I've done so, they were responsive thought that response was mostly to offer a refund.
May I ask which version you have (author, ISBN)?
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