If it happens by itself (no interaction from you) it's likely a fault. I've had that happen on a Kindle before and had to send it back. But the most common cau

If it happens by itself (no interaction from you) it's likely a fault. I've had that happen on a Kindle before and had to send it back. But the most common cause for me is when trying to tap the right part of the screen to move to the next page, I end up tapping a small link instead that jumps deeper into the book. Very annoying when it happens.