Lately, I've been running into a new (for me) issue. I'll put my SP4 to sleep, and then what I wake it up (from sleep or hibernate, as far as I can tell) there will be a blue screen with a spinning white-dotted circle. I can hold down the power button, get the swipe to shut down, but it simply returns to the same blue screen. The only way to resolve it is to hard (2-button) reset it at least one time and sometimes multiple times. Anybody else seen this, and have you found a resolution for it?