My g/f had the same fault with her iPhone 5, four times. Each time it was replaced under warranty with a refurbished phone until the last one when we demanded a brand new phone so we could sell it and buy the iPhone 5S. Anyway, it seems the iPhone 5S has the same fault and we'ev been batting emails and phone calls backwards and forwards to customer service and tech support for nearly a month. Their latest phone call said they have been able to replicate the fault and that it is a software issue. I'm not convinced and I think it's a hardware fault because it happened on her iPhone 5 before iOS7 was released. So, I wondered if any of you guys could replicate the same fault in your iPhone 5 or 5S. 1. Turn off wifi or be out of range of wifi. 2. Be out of range of 3G. 3. Send an email via the phone. 4. Take a couple of close up photos using your flash. Does this happen to yours... Girlfriends iPhone 5S and a friends iPhone 5S, both have the fault.