It was working fine and I left it locked for a while as I was doing other things. Minutes later as I was going to access the lock screen it was completely unresponsive and the screen was black. I had to perform a hard restart to get the phone to work again. Has anyone had this issue with their 5s yet? Do you think it's an iOS or a hardware issue? I'm on 7.0.1 btw and if it's a hardware issue, I guess I will have to take this phone back to Apple. I think I've experienced this on my jail broken 5 before, but I'm not too sure.