How to keep homesharing active from iTunes on Lion OS?

I have 4 Macs (w MBPs, 1 iMac, 1 Mac Mini) and 2 Apple TVs (latest). Only the Mac Mini is on Lion OS (10.7.4) since that is what it came with new. I use it to serve my media to the Apple TVs, but they can also get served from the other 3 Macs (all on Snow Leopard 10.6.8). Only the Mac Mini on Lion drops homesharing when not in use - the other Macs on Snow Leopard keep homesharing alive. While it is actively streaming, the Mini does not drop the feed. I have the Mac Mini set to never go to sleep or or to screen saver, so it should remain accessible via homesharing. But if I don't use it for an hour or two, it drops out of homesharing - and it is the only Mac to do so. I can get it back by quitting then restarting iTunes or by shutting down homesharing and restarting it while keeping iTunes open. Of course, a restart of the mini would also bring back full functionality. None of these are acceptable when you are sitting in another room trying to access media via Apple TV. As a result of the above, I am assuming that the problem is isolated within Lion OS and how it supports iTunes.
I have seen other discussions claiming Apple TV drops out, but my problem is definitely the Mac Mini on Lion since at the same time I can see it drops from the other Macs and not just from Apple TV - all homesharing devices lose sight of the Mini but keep seeing each other.
I'd love to downgrade my Mini to Snow Leopard but apparently can't. I'd buy an older used Mini, but I need HDMI - so, I'm stuck until this is fixed. My other devices will definitely stay on Snow Leopard until I see this problem resolved by Apple.
Any suggestions on how to keep homesharing alive with iTunes on Lion?

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How to keep homesharing active from iTunes on Lion OS?

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