hello All, Over the last few days I've encountered a problem when I call people on the iphone. The conversation sounds good at first but every few seconds its like I can't hear the person I'm talking to clearly, like its going in and out of signal, but I have perfect signal strength. I've also noticed that when I talk I sometimes hear myself through the phone, its very hollow, but i dont think thats how it should be. Should i make an appointment at the Genius Bar??