Welcome to the Apple Community.
Everyone has exactly the same Apple TV and Apple TV software, if you are having problems you either have a defective unit or more likely something wrong with the parts of your set up that aren't the same as everyone else's. i.e. your TV, receiver or cables. Try the Apple TV with another TV and HDMI cable.
Thanks but that's not really practical. I did try with another hdmi port and another hdmi cable and it still didn't work. I don't have/want another TV and mine is very new. It only seems to be a problem when streaming audio+video. What did work for me was switching from Safari to Firefox. There, I got sound and a picture and was able to watch my team win in Olympic hockey.