There has been a bug in the last two or three firmware versions with kepubs an embedded fonts. If you have the reader fonts set to "Document defaults" you get symptoms like you are seeing. Reopening the book or using the TOC to go to a new chapter triggered the problem. Tapping the screen to bring up the menus and then dismissing them will sometimes fix things. Selecting a font prevented this from happening.
I thought this had been fixed 2.10.0, but maybe it just changed a bit. On 3.0.0, it seems to be taking a lot longer to open a page from the TOC, but eventually it gets there. This is with both a sideloaded kepub and a purchased kepub.
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