I have had some ereaders (Cybook, Pocketbook, Sony, Kobo) and none of them have lost the page. With the Kobos I've been using sleep cover... and I don't lose the page either. So, I'm afraid it's not an ereader problem but something you do. I can't imagine what.
BTW: I've used cheap cover, Gecko cover and official Kobo cover... so the quality is not the matter either.
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