On my Windows Phone 8 device I find that the view very often jumps back up thread. For example, I was reading a 7 page thread. The double chevron takes me to top of page 7 (whatever that means in an infinite scroll experience...). I start reading and scrolling down. Suddenly I'm on page 5, then 3. I can jump back to page 7, but the same happens.

Is that common to other devices as well?