Something unexpected happened to me today. The Pro1 haddied in my pocket. It had at least 50% of battery remaining, and everything had performed normally before. But then I just found it powered off, and at first it looked like it won't wake up. I pressed power button several times, no response. Then I tried pressing vol up/down (don't remembr which one) and power button simultaneously. Then it finally woke up and gave me some "no command" text with android logo robot having it's stomach opened. It got stuck there, but by pressing only power button for 5s or so, it finally booted to OS. Now it works like charm again, no idea what that was.