@vazandrew Thanks mate, yes I am aware this is a volantary community user-to-user type deal, with, of course, no payment -- I was being sarcastic, sorry. It seems strange Apple would be unaware of any of the conversations taking place on its own website from both a legal and marketing standpoint, even if it's beneath one of its staff to simply post something along the lines of 'We are aware of these issues, we can't find a problem at our end, so it must be your setup.'
I have been posting on an exisiting thread for months: https://discussions.apple.com/thread/2808065?start=0&tstart=0 and watching the number of people with exactly the same problem as me, with, of course, different equipment, mount daily. There's over 11 pages of complaints now. It's the same story. ATV working fine -- update -- dropouts. Why it affects only some users and not everybody I don't know, perhaps there is some other common factor we are all not seeing.
The has been no 'definitive' fix: while some adjustments, like turning off wireless sync of iPhones etc has fixed one or two user's problems, it hasn't for the vast majority.
I've already bought an alternative media player, which works perfectly out of the box, but have the Apple TV hooked up to another TV in my house in the event of Apple releasing an update that fixes the homesharing problem.
I think any product that forces many users to log onto support boards and seek advice about navigating port settings etc is unacceptable. It should, ahem 'Just Work'.