Swordmaker, I upgraded to IOS 8 today and my iPhone 5s is running very hot. Is this normal?
No, it's not. Before panicking, try this quick fix that takes care of most upgrade problems. Do a complete cold restart. Here is the best procedure. First, quit all background apps. . . then do a cold start by holding down the home button and the off/on button simultaneously for ten second until the iPhone is forced into shut down. Then press the on button for a normal start-up, if the hot condition contnues, make an appointment with the Genius Bar at the nearest Apple Store.