I also have to mention that I've encountered another screen freezing bug.
I had an ebook from Calibre that I transferred to my Kobo Aura H20 and my Glo HD. Both would freeze when trying to advance to a certain page. When I investigated further I found that it was trying to render an image file that was stuck in the middle of the ebook. While the Calibre reader could read the jpeg, neither Kobo device could. When I then purchased the ebook from the Kobo store I had no issues.
I also found that you could just skip over that part and the rest of the book would read fine. If this more closely describes the situation that you have it's worth loading those epubs into Calibre and taking a more careful look at the places that make your Kobo freeze.
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