I got my 360 back the other day with 15.2 (rather than 14.2) installed, and have had two spontaneous reboots with loss of bookmarks so far. Fortunately when it does this (while page-turning) there is a hesitation of several seconds which serves as a warning that it is coming and I have time to note the page no. and when I come back into the book I can go directly to the page. If I do not do this it's irksome because when I re-enter the book it goes back not to where I was last reading but to where I started that session. When I then go to the page where the reboot occurred, it does not happen again when I turn the page, which leads me to think the problem is not in the epub file itself because if it was I would expect the same thing to happen in the same place. I am using only epub and FBreader.
I am hoping this will happen less often with 15.2 than it did with 14.2, despite everyone here saying 14.2 is more stable, and hope that further versions of 15.x will get rid of this problem.
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