My s3's charging port had the exact same problem! I got it sent in and had to use a loaner phone for 3 weeks. When I got the phone back it was completely restored and it's been about a month since that happened. Now however, my headphone jack is screwed up like you said... it only plays sound if you have the plug in the perfect position! I am fed up with samsung and i'm never going to buy another one of their products again. I do not wish to get my phone sent in and restored again. Can anyone else please help!