After using my surface I placed it on my desk and went to bed. The next morning it open the keyboard and unlock the surface, only to have it go on a spree of clicking and opening and closing windows. After rebooting it, it went away. It happened a 2nd time after reaching for the surface for it bit of pre-sleep surfing, only to find the same thing happening. A reboot seems to fix the problem and it hasn't happened since an update a few days ago.