I have experienced these problems in the past. Most notably, I would "turn it off" leaving it at the screen with a picture... essentially putting it in suspend state. When I went to read again, it wouldn't come back up even though I had approx. 50% battery when I stopped reading previously. If I put it on the charger, it wouldn't come back up. If I left it on the charger, after about an hour, it would reset and come back up. I did a lot of troubleshooting and talking with BN about it. They finally sent me a new battery and I haven't seen this bahavior since replacing the battery.
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