I just bought a Apple TV (3rd gen).
And I tested the AirPlay, AirPlay(mirroring) with other iOS device, it works fine.
For itunes home sharing, playing itunes video or photo are OK,
but there is some problem with music playing, the apple tv play one to two songs, then it keep loading. I need to reboot the router, then it function again.
very weird.
Apple TV and PC are connected via wired network.
router setting: Multicast IPV4 enabled, latest firmware.