For the past few days anytime i watch any HD content the picture after a few seconds goes right to standard quality. thought maybe a problem with HDMI cable but i switched cables and no change. I am wireless but i have a good connection and have never had a problem in the past 7 months since buying the Apple tv 2. I also thought since i mostly only use netflix for HD streams it was a problem with them but then i tried the NHL and MLB and the trailers and the same thing happens. Is there anyone else with this problem 
TV2 doesn't have an ethernet port or whatever. It's 802.11n compatible and is designed to be used in conjunction with Airplay and iTunes streaming.