One more issue I'm having with iOS 9 is that rotating the iPhone 6+ does not always cause the screen to rotate when it should, or the screen sticks for a long time then finally rotates. Sometimes I have to rotate the screen back and forth several times before rotation occurs. Other times the screen rotates at the slightest movement, as in way before it should as it hasn't been tilted enough to warrant a rotation. It could be the accelerometer is wacky, but I didn't notice this odd behavior until I installed iOS 9.