My iPhone has been with me for the longest time now. I love it and I never planned on buying the latest anytime soon. But recently, my phone shuts off whenever I click on the sleep button so I have to turn it back on. My friend has helped me resolve the problem since I'm not a very technical person. He installed the insomnia application but the only problem with it is that it consumes a lot of battery life so I have to charge it every now and then. Can someone help me fix this without using the insomnia apps thanks?