Hello, I noticed my 3GS draining the battery in 6 hours without making a single call. I also noticed that it vibrated every once in a while and I thought it was a new message. It seems that when I turn the phone to silent(vibrating) there is something loose and it keeps switching from silent to normal and of course when this happens it vibrates, now this is draining the battery. Has anyone had this problem before? its under warranty, I think, it hasnt been a year since I bought it, will apple replace it or just fix it.