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The navigation buttons not working is new (to me,), and the conditions to replicate not saving current page are different than the one I already identified. I would suggest using the Calibre ScrambleEbook plugin to create a copy of the affected books you can post here for further analysis.
Since bugs affecting Epub navigation like this were introduced with the recent 4.15 firmware, I suggest either downgrading your firmware, (links to the manually installed firmware files can be found in the developer forum)., or use the KoboTouchExtended Calibre plugin to load the books on Kobo in it's native Kepub format. (Note, in Kepub, books formatted like these will have misbehaving page number, but as far as I know, navigation through the book will work perfectly.)
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