If you usually power up you're Xbox One by using the " Xbox On" voice command, don't be alarmed if it wont work for you today , its because Microsoft are releasing a mandatory update to fix issue in the OS. If you use 'Instant On' on you're Xbox One , it will have automatically downloaded the update before powering off. After completion of the download you will be required to manually power the Xbox One back up. So dont go arguing with the Xbox One like a wally! For more information, read here.
voice activation ?? my word if it didnt come on when i said xbox on id try the button aswell microsoft are making people idle you dont even have to press a button to turn it on whatever next lol... :|
Even updates on Xbox One are messed up lol.... if people wouldnt read this they could easily think their console is fucked up XD y they do dis?!
I am sure they flush some boot settings during an update to make sure everything syncs in correctly. I am sure it will be changed in later updates.