I am an O'Reilly author and have had the same problems with some O'Reilly EPUB books, including my own. My workaround was to download the MOBI version and convert it to EPUB with Calibre (you should have access to several different formats when you buy an O'R book). This seemed to work better. However, after an unrelated factory reset, I found that the original EPUB versions worked fine again. Your mileage may vary.
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