Hell, a few weeks ago my wife and I were woke up at 3:00am on the dot...ungodly loud static noise coming from downstairs. Sounded like alien attacking or some shit...lol.
Go down stairs and the surround sound receiver is on full blast playing static and I couldn't get it to stop or turn off. Finally turned off and works perfect since. Weird stuff.
same style stuff at my house. its not normal as i have a buddy with the exact same tv as me and his has never had issues. we went from a 36" old school 1080p HD tv to a new 42" tv and it still does it! its not a power surge, or bad plug, we cannot figure it out.