On the iPad 2 4.3.1 my Radio app keeps shutting down when it is supposed to run in the background, even when I am only using iPF. So far it has always stopped playing music within 5 minutes of switching to another app. It runs fine when Radio is kept open, I.e. not switching to another app. On my iPad 1 4.3 this has never been an issue. The Radio app would keep running for hours at a time, while being in the background. I have both iPads here and do the exact same things, so I cannot understand the reason why Radio shuts down on the iPad 2. Does anyone have an idea, as to what might be the root cause of this?