I am testing my new Appletv on my iPad1 with iOS 5 using Airplay and have an intermittent problem, getting the message: "Airplay speaker not available. The speaker 'AppleTV' is currently being used by someone else." This happens on an occasional basis on the native apps as well as on third party ones, seemingly never on still photos. Can anyone help? I did the search, but maybe not with the right key words.