I had the same problem today, but tried my PC laptop and noticed there was a connectivity error in the network. Disconnected the laptop from the network, then added it fresh and it seems to be back to normal. When using the iPad with airplay i had lost the airplay icon apple tv option. Now its back! I think its proximity to the wireless router with the iPad2 that is the problem. Too bad you couldnt hook up a sub-router in a different room so the signal would always be excellent?