I've noticed my screen brightness changes with videos mostly. I've turned off all the settings that control brighness but its still there just not as bad. It seems like somthing to do with helping the screen get better contrast but its still annoying. Have you guys noticed this as well? I posted earlier about my surface going to mute on its own with the touch cover in another thred as well.But besides these two minor glitches I really like my surface, I love saying to my wife can your ipad do this....and it happens quite often.