Hot hot hot
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So about maybe once a week i notice that both my iPhone 5 (iOS 9.2.1) and/or iPad Air 1 (iOS 9.2.1) get really hot. It always happens around sunset, when f.lux starts "waking up" the screen...
(both non-jailbroken devices)
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If it's once a week or less I'm guessing it's another app or tweak you're using.