Auto Open of Bing App

Have you tried restarting the device? It sounds like something keeps pushing the search-button on your phone.

Sometimes (maybe twice since last november) I've had these "ghost touches" going on where the phone acts as if I was touching the phone constantly from somewhere and I havnt been able to properly operate the device, but usually this has been fixed by just rebooting the device.

This might be a bit too obvious, but are you sure you arn't touching the search button yourself as you hold the phone? :D