I've never seen gen3 displaing anything but x% for batery metter. I would guess the ? mean the it can't get battery state, maybe your batery is reaching end of life.
Contact bookeen, they can probably point out the source of the problem better than I can.
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In every case, upon re-opening the book, it opened at about 25% read, according to the progress bar. Different book every time.
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You mean all the book open at the "same" place ?