"People tended to get a bit excited, especially while playing Wii sports, and in some cases the control would come loose from their hands," Minagawa said. "The new strap will be almost twice as thick."
I've yet to see a situation where this can possibly happen but I guess when there are millions of remotes out there a one or three or five in a million chance for something to go wrong adds up. Also, people are clumsy and some are just plain dumb. (Maarten & I)