I spent 40mins on the phone to x-box live as my controler wa switching between 1st and 2nd quadrant on the console which i havent noticed a change in gameplay but it is really anooying as i notice it all the time , but it only does it with my black controller so i phoned up and explained my problem and they said i had to send it off and they will re-place it ... 40mins for a controller !! its stupid !!