I also have this problem, when I look a Video-Ts movie there is no problem for a while, when I start a new Video-Ts it starts with buffering all the time,
suddenly the sign came in “that my network is to slow”,when I change to an Avi movie, everything goes well,no buffering or other signs who destroy my
evening. When I looking in the “Network share” the connection is passed and OK. When I look at the signal strength all the marks are filled that means, what I think, that the network is OK and not SLOW!
What I don,t understand is that for a while it goes without problems an suddenly the errors are coming up. I reboot my Apple TV2 , reboot my Mediaplayer, reboot my share, nothing works, I stream from iMac via Airport extreme ,airport express (to power the signal) Apple2 with 4.3 season jailbreak.
All above take away the fun to watch movies via AtvFlash