Airplay keeps dropping out

When streaming from my ipad/iphone to the ATv, the connection keeps dropping and the tv goes back to main menu. The ATV will no longer be listed under airplay options on the iphone/pad either; this is the same for over wifi or bluetooth, tried on different networks also the same issue. It is improved if i turn autolock off on the Ipad as that sometimes kills the connection but it does still remain and there seems to be no logic in the fault appearance; it may be minutes or hours. I have tried reinstalling all software, doing factory resets etc on both the ATV and the IPad, turning airplay on and off, connecting to different networks, updating firmware now i'm out of options - any ideas. Model is A1469 firmware 7.2.1