I have to keep restarting iTunes on Windows 7 for Apple tv....

The sharing to the AppleTV works fine and is reliable, except that after some amount of time (even when my computer is active), I have to restart iTunes on the computer for the AppleTV to see content on the computer.

It appears that it's fine as long as the AppleTV is active. If I watch a movie and at the end of the movie switch to another tv show or something, it's fine. But if the AppleTV is idle for ?minutes, It won't see the share.

But I don't have to restart the AppleTV. I just need to restart iTunes on the computer.

Does anyone have a fix for this?