Am using the first generation Apple TV and the latest version of iTunes. In the past few weeks my Apple TVs (2 of them) have been frequently dropping its connection to my Mac Pro (whether set to "Sync" or "Stream"). Haven't had this problem in the past so I'm guessing one of the iTunes updates is probably the cause. Having gone through many threads on MacRumors as well as Apple's Discussion Forums, i tried two things: 1. Ensuring the Firewall isn't blocking iTunes (which it wasn't) 2. Set up my Mac Pro to be on a manual IP rather than DHCP Step #2 has now solved the problem. To be safe, both my Apple TVs are also on manual IPs now. For those not familiar, you can actually set up manual IPs on a network setup with DHCP. Just make sure your manual IPs are far away from the first IP allocation to avoid any potential conflicts. E.g. if your router is 10.0.1.1 you can set your Mac/PC to 10.0.1.100 and your Apple TVs to 10.0.1.101, etc. Hope this helps. Diagnosing problems on the Apple TV can be one of the most frustrating experiences!