I'm running an iPhone 5 with stock iOS 7.1.1 In the past 2 weeks, I've noticed that my iPhone gets unusually warm on occasion and the battery drains more quickly than normal. A reset of the phone seems to make the issue go away for a few days. I disabled background refresh, and I've always had location services disabled. Is there any way to see if a particular app is going haywire and driving up CPU use? I suspect that an app updated at some point and has bugs which are causing this.