Hm, is this new firmware? I was reading today in full sunlight, and suddenly got a thermometer icon and message I had to wait for the Nook to cool down to resume reading.
Took a while in the shade, and when it came back it had completely forgotten which book I was reading (let alone which page). All of the "amount read" lines had disappeared from the icons for several books.
After a while longer powered off, when restarted, all was back to normal.
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