I have a problem with home sharing. After watching one episode of a tv show home sharing stops working. When I want to start the next episode the loading icon just appears an nothing happens. When I restart the Apple TV it won't see my iMac library at all. the only thing fixing it is restarting itunes, but it gets annoying having to do this after each episode. this problem startet since itunes 11. before it was working flawlessly for years. I have latest itunes, apple tv 3, mountain lion and 2012 21 imac. I have also tried resetting the apple tv, rebooting the router but nothing helped. Any ideas?