I've seen various posts like this (and usually about the Libra). But, I've never seen a single solution. In computers, it's usually caused by the inductors on the gpu vibrating because of the high frequency they operate at. It's just flabbergasting that there would be any equivalent in a static display e-ink screen.
I suppose some mechanical wizard with a lot of money and spare ereaders could open one up, listen for whatever's making the noise and put a dab of hot glue or something on it. But, no one's ever done anything like that on YouTube. And, I can't see a normal person doing it.
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