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All sorts of weird things happen to SONY readers when the battery is not fully charged. And the fact that you haven't used the battery in a while suggests that might be the problem. I would make sure to give it a full charge. Using the AC adapter would be better, if you have it. Either way, don't trust the battery meter and/or light. Let it charge overnight to make sure it fully charges.
Failing that, a reset is your best option.
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