Strange things seem to be happening with Google lately. From channel-less clicks in Adsense to people getting sudden surges of traffic. It's almost as if Google had a massive data loss somewhere and had to revert to a backup or something. What would Google do if they suddenly "lost" a data center or part of it ?
This is called “the Big Google Dance†they are just trying a new algorithm to improve there search. This happens several times a year. The one happening now is a big one so you feel the changes.