One of my inner page had PR5 and over 125 backlinks. It has been around for some months and nothing have been changed much. Today, I noticed that page fell from 2nd position on Google to the second page, and it is now shown as 0 PR (white bar) with no more backlinks. There aren't any duplicate content as well. All the links that were pointing to that page ARE STILL pointing to that page now.
What could have caused this?
