In a similar situation with the Microsoft Xbox Wireless Gamepad. Ended up buying a USB power adapter so that I can plug in if I know I'll be stepping away longer than a skip around the corner.

Will unplug the wire for some freedom, but on occasion, have overreached a shoulder button and hit the power eject (How does that even happen), lose grip of the gamepad and it falls to the floor enough to turn it off, and have strangled a snurbble once with the cord of the wireless gamepad (it leaves no traces).

I'm hoping this will be fixed in 2.0. It's a minor inconvenience in town, a fairly big inconvenience if it happens in party play.