Keyboard stuck at lock screen; does not go away
This is a weird one.
Very often, I would find myself staring at a keyboard when I unlock the iPhone. Yes. I press the power button to bring the device out of standby and instead of seeing the "Slide to unlock" area, I see a keyboard drawn over it. This is a fully functional keyboard and I have to type my lock code on it in order to login. Imagine my plight when I see that after login this keyboard hasn't gone away! From this point on, whatever I do doesn't seem to cause the keyboard to go away - it appears over every app, home screen, app switching, notification center and ensures that the phone is unusable.
The only solution is to reboot the phone. I'm using latest iOS on iPhone 6.
iPhone 6, iOS 9.2.1