Do you swipe or tap to turn the page? If you don't read and move around the library for a while, does it happen? Does changing books "reset" the time it takes to happen?
Your problem description is similar to a problem with text selection that I occasionally see. Sometimes when I select some text, the device hangs. Closing the cover and opening it gets it going again. When it happens, it is almost always when I select from the right side of the screen to the let. And, I have triggered it with a slower than usual swipe to turn the page or a slow tap where I moved my finger a bit. This is happening a lot less in recent firmware. A way to avoid this would be use the bottom of the screen, in the bottom bar area to turn the page. Long term, that might not be good, but to eliminate causes, it should work.
It could also be a hardware problem. If you can consistently reproduce it, and a factory reset doesn't fix it, then blaming the hardware isn't unreasonable. I'd try the test above and if they don't help, exchange it.
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