Hey, I've had the iPhone since it came out (like I'm sure most people here have).. and I love this thing. I have had no problems at all with it... except for today. I received a call from a couple of people, pick up, and place the phone to my ear but don't hear anything. I put it on speaker, and then voila... sound. Another thing, when I place the phone to my face while talking, not only can I not hear anything but the phone won't shut off the screen to preserve battery. I tried a restore on iTunes and I still have the same problem. Has anybody here had this same issue? If so, what's the best course of action? Return for a new one or "repair" at the Apple store?
P.S. I'm a bit on the paranoid side, so if lets say I take it to the store for a return/repair.. Do I have to delete all the songs I acquired outside of iTunes?

P.S. I'm a bit on the paranoid side, so if lets say I take it to the store for a return/repair.. Do I have to delete all the songs I acquired outside of iTunes?