Ive had my iphone 3gs since about late July and recently it has been randomly going black and nothing i do, whether it be hit the unlock button or the home button, will get it to respond. I have to reset the iphone by holding the home and unlock button and Im afraid that its damaging my phone. Ive already had to restore my phone once and don't want to do it again, do you think I should take it in to Apple store to get it checked out or try and get a new one?