I found that the first time it went into sleep mode by itself something failed and drained my power - it never made it to power-off mode. It only did that the first time and since then I've not had any issues with sleep/power off (other than the common issue of: "when I put it into sleep it should STAY in sleep" ) I don't think the firmware upgrade has made a difference for my battery life. It's ok, but I'm still not seeing anything like 8000 pages either. I've read about 500 page turns and my battery shows a bit over half.
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