Because your hands are gripping the 3DS in such a way that you accidentally press the power button, right?Sometimes, especially in fast moving games, you can bump it accidentally. That happened to me last night when I was playing StarFox. I got to this one segment where you're fighting this skeleton thing with a tank, almost had it dead and then the "software closed" menu popped up.
I had my rage face on after that. My wife giggled at me. She thinks my rage face is cute.
