Hi - I just defected from Blackberry yesterday and got an iPhone 4. So far I really love it. I came from a Curve. I have two questions though - I've noticed that a few times when I have been using an app (Facebook, a prayer app, calendar) it kicks me out of the app and brings me back to the home screen. It did this twice with the facebook app, both times when I was commenting on a post. Is this a bug or am I doing something wrong? Has this happened to anyone else? And how do you close out an app so that it isn't running in the background? Thank you!!