A lot of ereaders will have the charge light come back on if you pull the plug and then plug it back in. My Kindles do this. I haven't noticed on my 950, but I haven't tried it either.
You could have a corrupted book file on the Sony. I suggest doing the factory reset and then just add a book or two that you are currently reading and see if it makes a difference. Make sure to have all of your books backed up first.
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