The random shutdown happened to me a couple of weeks after I bought my Kobo last January (2013). It started after I left it on the charger for more than 24 hours. Although that shouldn't have had ANY effect on the battery, it sent the battery reading out of whack and mine would go from 52% to a straight shutdown. Annoying as hell. My only choice was to exchange it for a new one, which I realize you can't do anymore. I have noticed battery issue again after 15 months and the only thing that seems to help is letting the battery drain completely, leaving it for a day, then charging it again.
Hope this helps. FYI, if I could do it over again I would have bought a Nexus 7 - at least you get immediate Android updates instead of being stuck at 4.1.1 forever. It's the forgotten tablet, might as well be a Vox.
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