Iphone 5 when in usage and no lock screen doesn't shut off, but as soon as i put it in lock screen the iphone 5 shuts down and i must press home power for 20 sec to start it again and this happens always when i lock my phone. Now i'm using my iphone 5 with Ios 9.2 with no lock screen and with low brightness to save more battery. Apple Iphone 5 isn't as you expected.
iPhone 5, iOS 9.2
