What firmware version are you using?
Also, it might be a battery problem (I've read in this and other forums that some batteries shipped with HanLin devices can and do give problems): you can buy a new original Nokia battery to replace you device's one and see if it is any better.
I'd try other firmwares before, though: if an lbook or EZReader (or OpenInkPot) firmware solves yoru problem, you don't have to spend money for the battery
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