With my previous SP2, if it went to "sleep" mode after a preset timeout, I was able to wake it up by double tapping the screen. If I "forced" it to sleep (by pressing the power button), I'd need to press the power button again to wake it up. Now with my new SP2, I have to press the power button to wake it up. Double tapping doesn't do it. Do you notice the same thing with your tablet?