I've had a number of epubs crash my kobo.
Most of the time, if I strip out all javascript and then do an epub->epub conversion with calibre, it fixes it. Sometimes the errors in the epub are too clever for that, and I have to bring it into the calibre epub editor and run it through the bug fixes a few times.
Usually the result is a book that leaves the kobo more responsive and is easier to read, and it rarely takes me more time to do than it would to read the table of contents of the book.
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