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I have the same thing happen with the Bing app, and I'm certain that the issue is related to the speaker and its proximity to the buttons. For me, I have the Bing app launch randomly whenever I am playing games or watching videos. I recently downloaded a game and the Bing app launches consistently at the same place in the game. I turned the sound off in the game options and the Bing app didn't launch during the game. I also turned the sound back on and plugged headphones in and same thing, no Bing interruption. So, this leads me to believe that maybe the sound coming out of the speaker might be vibrating something inside the phone that triggers the Bing/search button to be "pressed". For anyone else having this issue, try turning the sound off (either in game menu, or with volume buttons) or use headphones.