i got a new Iphone 3GS 16GB 2 weeks ago. worked fine until about 2 hours ago, when the phone started to get extremely hot, and didn't respond to any button or reset, charge or docking. it eventually started working, but the screen was very dim, and flickered from dim to bright, and now it doesn't respond to any charge or reset......what is the problem? will my apple store replace it or send it away?