Years ago in firmware 2.3.1 there was a bug that affected ePubs in this way, but only if the margin slider was in a certain position (at the minimum setting I think, but can't remember exactly) and it was fixed in firmware 2.3.2.
Since then I've never seen the problem with ePubs on my Glo unless there was something wrong with the TOC in the book, and then I think it usually went back to the beginning of the chapter or beginning of the book rather than just a few pages.
(But if it only happens after powering off the device then I probably wouldn't notice, since I never do that if I can avoid it.)
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