I have an iPhone 4S and whenever I use airplay to play music on my speakers connected to an airport express it causes my entire network to crash. My home network consists of one airport extreme and two airport express. I have an old ipod touch running 4.2.1 and it hasn't caused any problems. Is this an iOS 5 issue, airport express issue, or iPhone 4S issue? Everything is updated to the newest software. Anyone else having this problem?