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It happened to me once in the last 8 months, whilst running 1.9.14. I'd be worried if you start getting this more frequently, which would mean your battery is giving up (i.e. the battery can't support the required current when refreshing the display). Keeping it simple, once or twice is ok and probably a software glitch, but more than 3 or 4 occurences of this problem might indicate your battery is dying.
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