While I can't help with parts, I can help with a workaround.
With a book open, look closley at the right edge of the screen. You will see that it looks like the pages are fanned out just as a real book would do when it's held open.
Tap on the edge (I use my right thumbnail or index fingernail) and it will page forward.
Sometimes, I page forward this way rather than using the button as it takes less force.