I've noticed recently that the silent switch on my phone is not staying on, it seems easier to push back to noisy mode than before. As a teacher this has embarrassed me in front of class once so far. Two quick questions: 1. Is this a known fault or one experienced by others? 2. My iPhone has some scratches to the screen/chrome bezel but none anywhere near the silent switch - will Apple use this as an excuse not to replace/repair the phone? I've had my phone replaced once before after 2.2 stopped the phone from making calls reliably and then they just swapped it for a new one at the genius bar, if they agree that the switch is faulty would they want to send it off or would it again be a straight swap? The reason I'm asking this before going is my nearest genius bar is a 4 hour round trip away so I need to know if it's worth my time and travel costs! Thanks!