I bought my Surface Pro 2 about a month ago and everything has worked swimmingly so far but yesterday i noticed that when i close the type cover it no longer puts the Surface to sleep though it did when i first got it. It just stays up with the display on unless i press the power button at the top. I checked in the power options window and all the settings for closing the lid are set to "Sleep". Not sure if it's an issue with the device, user error, or faulty Type Cover. And yes, i have tried detaching it and reattaching it.