Size should make no difference in "freezing"..... however..... With a larger book it will take longer for it to format it. I would let it set a couple of minutes and just see what happens.... if you already did that then it could be a problem in the formating of the book or it's table of contents. I have 2 PDF's that do the opposite of what you describe. That is, when I open them up in Calibre that lock. But on the reader they open up (slow) but fine.....
Anyway, hope you get it sorted....
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