Recently my iPhone 4 has been giving me trouble - if an app is up and I want to minimize it, pressing the home button doesn't minimize it no matter how many times or how hard I press it. I actually had to restart the phone to get it back to the regular home screen. Also, when the phone has hibernated and I want to move the slider over, I press the home button to make it appear, but now I have to press the button on top to do so - ? I never had to do that before. I don't know if these problems are related or not. Then, as suddenly as the problems appeared, they disappear and my phone behaves normally again, without me having to stand on the home button to make apps disappear. I'm worried that my phone may be on the verge of not-working. Or am I doing something wrong?