Constant need to reboot AppleTV *AND* restart iTunes for Home Sharing to work

Question

Environment:
iTunes Host Computer:
AppleTV's: Three. All Model A1469, All currently running latest version of OS, [7.1 (7003)]
Network: Wired Ethernet (1000MB) using three D-Link Green DSG-1008G dumb routers, one Apple Airport Extreme (running 7.6.4), and one  AT&T DSL Gateway directly connected to the Airport Extreme WAN port.
Situation: Since the latest updates to OS 7 on the AppleTV, and 10.10 - Yosemite on the iTunes Host Computer, I've had issues with Home Sharing NOT being able to hold a connection between the AppleTV and the iTunes Host computer. This disconnect shows on up as a "...turn on home sharing in iTunes..." screen on the AppleTVs. (I should also note that you can't access Home Sharing during this interruption via another computer either. I've tried this, thinking it was an issue with the AppleTV, however, the computer just will not see the Home Share. Once iTunes is restarted, the Home Share shows up in the iTunes shared list.)
I actually think there are TWO problems here; 1) the AppleTV loss of connection to the Home Share, 2) The need to refresh the iTunes Home Share.
Problem 1 is demonstrated by this example: IF I restart iTunes, then wake an AppleTV to view content, I get the "...turn on Home Sharing..." screen. If, however, I do nothing else BUT reset the AppleTV, the Home Share works perfectly.
Problem 2 is demonstrated by this example: IF I wake an AppleTV, then reset that same AppleTV without restarting iTunes on the host computer, I get the "...turn on Home Sharing..." screen.
The ONLY way I don't get the "...turn on Home Sharing..." screen is when I reset the AppleTV, AND restart iTunes. Somehow I don't think this is the way this should be working.
NOTE: In all of these scenarios, I've never had to re-login to Home Sharing on the iTune host. The credentials are working.
NOTE 2: I've completed ALL of the Apple recommended troubleshooting steps, and a good number of other ones suggested by this forum, including renaming the host computer, changing the Home Share Name, reissuing IP addresses, rewiring the network, opening or shutting off of all firewalls, etc.
Any assistance with this issue would be greatly appreciated.

Answer 1

Environment:
iTunes Host Computer:
AppleTV's: Three. All Model A1469, All currently running latest version of OS, [7.1 (7003)]
Network: Wired Ethernet (1000MB) using three D-Link Green DSG-1008G dumb routers, one Apple Airport Extreme (running 7.6.4), and one  AT&T DSL Gateway directly connected to the Airport Extreme WAN port.
Situation: Since the latest updates to OS 7 on the AppleTV, and 10.10 - Yosemite on the iTunes Host Computer, I've had issues with Home Sharing NOT being able to hold a connection between the AppleTV and the iTunes Host computer. This disconnect shows on up as a "...turn on home sharing in iTunes..." screen on the AppleTVs. (I should also note that you can't access Home Sharing during this interruption via another computer either. I've tried this, thinking it was an issue with the AppleTV, however, the computer just will not see the Home Share. Once iTunes is restarted, the Home Share shows up in the iTunes shared list.)
I actually think there are TWO problems here; 1) the AppleTV loss of connection to the Home Share, 2) The need to refresh the iTunes Home Share.
Problem 1 is demonstrated by this example: IF I restart iTunes, then wake an AppleTV to view content, I get the "...turn on Home Sharing..." screen. If, however, I do nothing else BUT reset the AppleTV, the Home Share works perfectly.
Problem 2 is demonstrated by this example: IF I wake an AppleTV, then reset that same AppleTV without restarting iTunes on the host computer, I get the "...turn on Home Sharing..." screen.
The ONLY way I don't get the "...turn on Home Sharing..." screen is when I reset the AppleTV, AND restart iTunes. Somehow I don't think this is the way this should be working.
NOTE: In all of these scenarios, I've never had to re-login to Home Sharing on the iTune host. The credentials are working.
NOTE 2: I've completed ALL of the Apple recommended troubleshooting steps, and a good number of other ones suggested by this forum, including renaming the host computer, changing the Home Share Name, reissuing IP addresses, rewiring the network, opening or shutting off of all firewalls, etc.
Any assistance with this issue would be greatly appreciated.