Use Calibre with Kobo Utilities to check the SQL database to make sure it's not corrupt.
I am using a patched H2O and no freezes. But I do not read kepub and I don't have full screen enabled.
If all is well with the SQL database, try reading that eBook as a plain old ePub and see how your H2O gets on.
Last edited by JSWolf; 12-28-2014 at 08:35 PM.
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