Hey Iron Dog, please don't give up. I got my 360 in May. I did have trouble with 15.1 and downgraded to 14.2 I also don't bookmark as when I open it up, it goes to the page I was reading when I shut it down. Most of my books were pdf even with 14.2, they would lock up after about 20 to 30 pages read. I would then look at the page #, exit out of the book, reopen the book, then use the go-to page # and continue reading until it locked up again.
I don't really blame it on the reader as much as the pdf itself.
I have since converted all the pdf to epub with Calibre, and then used Sigil to clean up the epub as needed. I haven't had a lock up since. I read for hours just about every day.
Don't give up and keep asking questions, hopefully you'll find that you love your 360 as much as I do.
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