Apple has released a firmware update for the mid-2011 MacBook Air. This article explains how to get and install it. I had to go to the download link in the article to get the update, the App Store did not show it. Also, after installing the update the Air will Restart. Mine ended up shutting down all the way and would not boot up. If you have this problem just reset the SMC (explained in the article) and it will startup.