I have a new iPhone 4s that I got about 2 months ago and it is doing something that I don't understand. It has randomly turned off 3 different times and wouldn't turn on until I pushed the power and home buttons for over 10 seconds. Obviously that remedies the issue, but I am concerned that this could turn into a bigger issue later after I am outside of the 90 day return window. Anyone know why this might be happening. And its not because the battery is low. When I do get it back on it had almost 30% battery left. Should I back it up and try and get a new one. FYI, I have had another iPhone 4s for work for the last year and never had this issue with the other one. Thanks.