I am also having a lot of issues with voice commands. My xbox, to this day, has never turned on at the command of my voice. Once I actually do turn it on by hand, the commands work most of the time. It seems to have it's moods when it wants to cooperate, and when it doesn't. for the most part, I just use my system with the controller. I only resort to voice commands when my hands are busy, or I want to show it off to a friend.