Oops. It looks like some Battlefield 3 players may have been banned by accident due anti-cheat multiplayer software Punkbuster. EA issued a very brief statement about the subject today:
"We are investigating an issue of Punkbuster bans that were incorrectly applied to some of our players. Please understand that our game advisors are not able to access or overturn Punkbuster bans, but we're working with our partners at Even Balance to get this resolved as quickly as possible."