MS released new firmware today for the Surface devices. A long list of fixes including power issues.
Microsoft Surface Book and Surface Pro 4 fixes - Business Insider
Microsoft Surface Book and Surface Pro 4 fixes - Business Insider
what happens when you try to pull updates again? if this was a normal device, i would say delete it, and reboot, it will be reinstalled on next reboot, but since this is Firmware related, i would contact ms support to be on the safe side.
so far my SB is working well, its still early, but sleep mode is working like it should, my laptop didnt overheat in my backpack on the way back home