I noticed yesterday that my - Volume button wasn't working. It still clicks just as well as the + button, but nothing happens. After messing around with it (power off/on, hard reset, and pressing really, really hard) I got it to work, but if I leave the phone alone for a few minutes and come back, it stops working once again. Do you guys think this is a hardware or a software issue? If it's software I'll wait it out, but if it's hardware I think I need to make a trip to Apple.