I know this is an old thread, and I'm wondering if this problem goes on. My Glo has been going through some serious problems, so I left it behind and used my old Nook ST Glow. Everything goes well until the battery hits the 50% mark. Then it simply won't turn on again. But leaving it overnight with 100% battery and waking up next morning with a completely unresponsive reader makes it unreliable for almost all situations. Even with firmware 3.12.1 as we speak is no good. I've changed the battery for a new one, and the problem persists, so I have to say it's either the SD reader or the software.
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