Originally Posted by Apoorva
I think, it might be Google dance because dropping the position from top position to fifth page is not a usual thing.
I thought the Google Dance theory died out a few years ago? My understanding is that it was related to what were then (roughly) monthly updates to ranking positions, which were applied over a few days so that a site's position could "dance" around until all the updates were applied. But now that Google updates all the time, it is no longer a factor.