Hi... I have a question: Last evening (say about 1:00AM), the battery meter read 41%. I deliberately left the device unplugged to see how much the battery would drain. This morning when I checked (around 9:30AM), the Surface was off - totally drained! My settings are as follows: Under both battery and plugged in profile, the device is set "not to sleep". When the cover is shut and when the power button is pressed, the Surface is set to sleep. Any idea what's going on?