Hey TheRonRon,
Thanks for the question. The following resource provides some great steps for troubleshooting AirPlay and mirroring from iOS devices. It sounds like the root of your issue may be that there are too many devices connected to AirPlay at once:
Resolve issues with AirPlay and AirPlay Mirroring from iPhone, iPad, and iPod touch - Apple Support
http://support.apple.com/en-us/TS4215
Resolve performance issues with AirPlay or AirPlay Mirroring
If you are experiencing intermittent playback or significant network lag with AirPlay or AirPlay Mirroring, it could be due to a weak Wi-Fi connection, interference, or the distance between the Wi-Fi router and your iOS device, Apple TV or AirPort Express.
Try these suggestions:
- Ensure that other devices are not trying to stream to the same Apple TV at the same time.
[…]
Thanks,
Matt M.