I have an iPhone 4S on iOS 7.0 that consistently disconnects from WiFi after a few minutes if I lock the device. It does have a passcode. I was considering upgrading to iOS 8+ but Hangouts updated for iOS7 so I didn't bother. Is this a bug or normal behavior, and can it be stopped with iOS 8+? If this isn't normal behavior I'll go ahead and reset network settings as plan A.