My home button is a little flaky. A few times a day a single press of the button will make the app switcher come up. I want to exchange my iPhone at the genius bar but I'm worried about a few things. 1. They'll think I'm crazy. 2. What if I can't make it do it there? 3. I'll get an iPhone with other problems (yellow screen, wobbly buttons, proximity sensor issue) On the other hand, I may get one that works the way I want and perhaps if I'm lucky I'll get one with 4.0.2 pre-loaded on it. What is your advice to me?