I just got my wife a new Nexus 7 and after getting it all set up, there are 18 (in portrait mode) small arrows at the very top of the screen (above the google search bar) that grow down and end in small lines and cycle doing this over and over. I can't remember when they started but they have been doing this for several hours now. I believe they are associated with an app but touching them has no effect. Anyone else experience this?