It makes absolute sense that if you power the Kindle off (not sleep mode, but off) that the place in a book would be lost. The .mpb file (which holds the place left off for each book) only updates when you exit the book. When you resume from power off, you go back to the menu screen, therefore it wouldn't know where you were.
I don't see why people power off instead of sleep mode anyway, but if you do, exit to the home screen first. If you want to be double-certain, set an alt-b bookmark.
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