I got a 6+ had it a week and had the screen go black and locked me out while rotating it between portrait and landscape 4x so far. It happened whilst on the main home screen, in the built in message app, chrome app, and the weather channel app. It has happened without a keyboard in view and with a keyboard in the view. Any body else seen this or have had this happen to your iPhone 5, 5s, 6 or 6+ with the newer iOS 8 installed on there iPhone? It is very intermittent and once the phone goes black it locks you out of your phone and goes to the lock screen. After each time it has done it, I was able to unlock my phone and open the app back up. It has been annoying when it has happened 
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