Anker 20100 problems

my anker 20100 started lighting up randomly with nothing plugged into it, should i be worried

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Is it fully charged? Was the button pressed? When you say lighting up randomly, what is lighting up?

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the lights on the side saying what battery it was at was lighting up randomly, it was slightly used but still at 4 bars

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Does the button have a small bit of play (movement) when you run your finger over it? Try giving the button a blast with some compressed air etc as you might have some dust/dirt around the button mechanism which is replicating a button press.

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Some of them light up when you plug/unplug them.