My Apple TV 3 randomly disconnects from my MacBook Pro while on AirPlay

I was just about to ask the same thing. Is happening to me as well. Watching a movie and it reverts from mirroring the display on Apple TV, to playing sound and video through my macbook screen. Apple TV just goes back to main menu, so is not resetting or anything.

Anyone got a fix?

No promises, but try signing out of HomeSharing on the ATV and the Mac, then sign back in on the Mac first then ATV. I've been getting AirPlay dropouts from my iPhone-ATV and this seems to have helped.

SSame thing here. Doesn't matter if I disconnect and reconnect. For my purposes the Apple TV has become a brick

That would indicate a network issues.

Reboot ATV and router

Make sure router is up to date

If on wifi try ethernet

Go to istumbler.net to get a report of the network, look for signal strength and noise