Book is fixed(and others). 260k is standard for Sony conversion correct, but the book froze at those settings. I changed it to 100k and now it works fine.
What I did was first exploded epub. Delete the css file and "page-template.xpgt" if it exists. Rebuilt the epub, then converted from epub to epub with my own settings in preferences/common options and all the problem books now work fine. In fact I do all these steps for all my books except I leave the setting at 260k for non problem books.