As I just discovered, the PRS-600 requires you jump quite a few hoops before it will jump to a saved bookmark (open this menu, open that one, select bookmarked page, etc). So I would rule out the accidental bookmark jump here. I'd also rule out accidental font size change, since the font size is not changing when the page does.
I thank everyone for their input, but the responses lead me to realize the difficulty of resolving this issue if you don't know the cause. So I think I'm going to have to give this some time, and do a better job of trying to understand what is causing the unwanted page jumps in my e-books by paying closer attention to the conditions before it occurs. Its likely to be due to different reasons, since they're very different readers.
e.g. I guessed that at least some of the time, the book cover of the Sony PRS-600 is causing unwanted button presses, perhaps when holding/carrying the reader near the location of where the buttons are located. If this is the primary cause, I might try getting a hold of a Sony T2, stuffing that in a DVD case, and see if that stops the unwanted page jumps.
Quote:
Originally Posted by Dulin's Books
are you changing font size? i havent checked this in years but back in the day people would get confused between actual page number of the book and the virtual page number dependent on font size and reflow.
it's possible on the sony(again havent look at this in along time but i do remember it happening) that if the font size is changed accidentally it looks like you are some actual pages distant from the correct point when you are only virtual pages distant.
as for your above example. i suspect someone accidentally bookmarked page 9. when you were fiddling with it and changing position etc you somehow evoked the bookmark and returned it to that page.
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