iTunes Home Sharing on Apple TV drops after a few minutes on Belkin N750
Working with Belkin we found an update to the Belkin router that fixed the issue. You may want to update if you are not up to date, version: 1.00.49. The standard update check in the router settings did NOT find this update. 

en-us-support.belkin.com/app/answers/detail/a_id/5359