My Xbox whenI restart it doesn’t turn on by its self

Hi Robert! My name is Pam. I'm an Independent Advisor and I'll be glad to help you today.

Solution 1. Power cycle your console

Please Turn off console > (press and hold power button for 10 seconds) unplug everything from the console > wait for 2 minutes and plug everything back > Turn On the console.

Solution 2. Try to do a soft factory reset without removing any games and apps.

Press the Xbox button to open the guide.

Select Settings > System > Console info > reset then keep my games and apps.

NOTE: This will delete the profiles on your account, make sure that you remember the email and password to your account.

I hope this helps. Feel free to ask back any questions and keep me posted.

Do you have a kinect?

sometimes it may recognize you and turn on, it happens to me sometimes.

If you have instant on enabled or "Keep me updated" enabled this could be why.

Also if you have the Original Xbox one console, try taking a soft damp cloth and cleaning off the power button on the console. This happens to me quite frequently. The oils from your fingers will leave fingerprints and some times the slightest breeze will
cause your left behind fingerprint to turn the Xbox on.

My Xbox One has done it a few times. It is the original black Xbox One, and so has the touch sensitive button, and sometimes just the slightest touch from dust to a hair can turn it on.

Mine does it sometimes while updating. If it is bothering you a lot you can unplug it, or just set it to energy saving as denis has said.