I've noticed in the latest firmware that occasionally there is a very long delay (1-3 seconds?) between when I hit the power button and when something happens. If not patient, and you hit the button more than once, you may end up waking it up and putting it back to sleep immediately (or vice versa). Sometimes the delay is much longer than 3 seconds. This might have something to do with the contents/structure of the current book being read.
Occasionally. I press the power button briefly at exactly the wrong moment, and the device thinks I was holding it down and turns itself off completely.
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