I think that @Frenzie is right. If you read the page within a few minutes, the page turn response is fast. If (like me) you get distracted a lot and take five or more minutes to turn the page, then the buttons/touch screen can become unresponsive as the device goes to sleep. On some of my PB devices, I have to press the button or touch the screen twice to get a response (once to wake the device, and again to start the action). I wonder if the OP occasionally takes longer to turn the page?
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