Its not just you. It's actually a problem with the newest Xbox One update. This happened to me twice yesterday when playing Battlefield 4 and KI. It went totally black for me, the only fix right now is to old the xbox button for 10 seconds to fully reboot. I just unplugged my console and it "fixes" it temporarily. I'm guessing an update will be coming soon.
Here's a story from Gamespot.com about the issue:
"The latest Xbox One update, which brought a host of new functionality to the system, has not gone off without a hitch. Gamers on Reddit and on the official Xbox forums have noted their frustration with a new issue that makes the screen go black after the system powers on.
Thankfully, however, Microsoft is aware of the issue and a workaround is already available. The official Xbox Support Twitter channel says you need only "power cycle" your Xbox One by holding the power button for 10 seconds to fix the issue. Simple enough.
Unfortunately for some users, the Xbox One "black screen" issue interrupted their Titanfall beta gameplay sessions. Though it's a headache and an inconvenience, the issue does not appear to be very widespread or significantly damaging, so you can rest easy and continue playing Titanfall until the beta ends tomorrow, February 19.
The February Xbox One update rolled out on Friday, February 15. It added a battery power indication and USB keyboard support, while also improving storage space management. The next major Xbox One update will arrive in March, a week ahead of the Titanfall launch."