I found a following solution which worked for me after playing a bit around here with my devices:
I checked out my (Netgear MBR624GU) routers settings and found it's a "b/g-Mode" only model!
Firmware upgrade on the router didn't solve anything, so I switched off wifi on my MacBook
and connected it with an ethernet cable to the router, restarted the router, the MacBook and the ATV.
My iPhone 4 on iOS5 got no reboot.
After that, I found the problem solved....
When switching back my MacBook (late 2008 on Lion 10.7.2) to WIFI (b/g) for testing, the troubles came back.
So i decided to think, as I could not solve a b/g/n mode (software ?) problem on my Devices,
to swap my router for a newer N-mode supported model (Netgear MBRN3000), which also brings
more security (and speed) to my network. I adjusted the new Router to "N-mode" only.
Now, the ATV, MB and IPhone 4 work smoothly together in Wifi-N-mode.
I may have found a solution/workaround for the airplay problem occuring in conjunction with the iPhone 4S. I tested it with my B&W Zeppelin. So far I had the issue described here, that after a few minutes of airplay playback the Zeppelin used to crash and even had to be rebooted. In my environment this reproducibly occured after 2-3 minutes airplay playback at maximum. When I deactivate the option "Cellular data" under "Settings" -> "General" --> "Network" - which does not limit the functionality at all while being at home joined to my home WLAN - the issue does not seem to occur anymore! Final tests still have to verify this workaround, but I am pretty sure meanwhile, that this is a valid workaround. The idea came to my mind during watching reviews in the App Store concerning the "Samsung remote" app, which in conjunction with an iPhone 4S crashes immediately after starting the app. In one recent review it was mentioned that deactivating "cellular data" resolves the problem, which is true for the "Samsung Remote" App - and it seems to be also true for the Airplay playback. Maybe both issues with both apps are interrelated.
I have two iPhone 4S. The white one crashed my wifi (AP Extreme rebooted) every time after 1-2 min Music.app AirPlay streaming; but, the black one works perfectly well with AirPlay. All configurations are exactly same in two iPhones. Finally, I decided to reboot the white one.... voila.... problem solved. I guess this might be a bug in iOS.
Got the same issue !
I thought I had a faulty 4S until I saw this thread ...
The airplay from iPhone 4S music player sometimes drops the whole network, sometimes gets the Zeppelin into "Limbo Mode" that needs complete restart.
I experince this drop everywhere between 30 sec - 1 hour of airplay.
I tried resetting then reinstalling each one of them (iOS 5, BW ZeppelinAir and TimeCapsule).
Airplay from my MacBook does not stop even after 10 continuous hours.
Airplay from an iPhone 4 works until the battery finishes.
I looked into my ruter logs and I think airplay drops exactly when it rotates the TKIP group key for the WPA security.
My guessing is that there is a bug in the iPhone 4S WiFi software driver.
This could explain why it drops the whole network.
iPhone 4S has a new WiFi network card that supports wireless-n over 2.4 Ghz (65 Mbps).
iPhone 4 has only wireless-g (54 Mbps). So the new WiFi software might have problems.
I might be wrong on this .... but I'm sure there's nothing wrong with the Zeppelin or TimeCapsule.
Equipment I used to test this:
Time Capsule 3rd Gen
B&W Zeppelin Air
iPhone 4S 64GB Black
iPhone 4 16GB Black
MacBook Pro Early 2011
Similar scenario as most others.
4s drops it's wi-fi connection about 15-30 seconds into using AirPlay with my Apple TV 2. The Apple TV is hardwired to the router. This occurs whether I'm trying to play music, videos or mirror to the Apple TV. When the 4s drops its connection, it will not connect to the wi-fi network again for several minutes. The Apple TV is on the latest iOS version.
Had a 3GS and it had no issues streaming music to the Apple TV. It was using iOS 5. My wife's iPhone 4 also using iOS 5 has no issues with AirPlay. There is something about the 4s that is causing the issue. Not sure if its hardware related because it has streamed several hours of Netflix over wi-fi without ever dropping the connection. The issue only occurs using AirPlay.
I believe Pig30n's theory is correct, related to TKIP security. I disabled wireless security temporarily on my router and AirPlay worked as expected for 10-15 minutes. No network disconnects. Now we just have to hope for an iOS update that can fix the issue because I don't want to leave network open. Last time I did that the neighbors used 20GB of my 200GB monthly cap.
Have just purchased an Iw1 Home Airplay speaker and I am having problems with dropouts after a few seconds when using my iphone 4s. The speaker works fine over Airplay with an iphone 3gs, Ipad 2 and imac 27".
I also have an Apple TV 2 hard wired to my router and the airplay to this works flawlessly with all devices including the iphone 4s. Confused as to why the iphone 4s will work with the Apple TV but not with the I W1. Any suggestions would be appreciated.
I called the apple support and they sent me a new 4S to replace my old 4S (10 days old) one. Still having the same problems as all of you!!
And: This problem is not only related to US iphone 4S! I'm living in germany.
I called the support again but they can't help. The offered me to send me another new phone.....
This is the worst cell phone purchase I ever made (an not my first iphone). Do something apple!!!