I was scrolling past your thread, and said to myself "good thing I don't have that issue".
Left my Surface Pro running to go do something. When I came back, the keyboard didn't work.
I did my usual, disconnect and reconnect the keyboard. Still didn't work.
Touched the screen, and noticed it wasn't responding as well.
Did a force reboot by holding down the Power & Volume Down Button.
Hoping this isn't an on going issue.