My iPhone 5 did not have any issues related to any of the suggested fixes for the unresponsive touchscreen issues while running iOS 8, why now with iOS 9 do I need to try these suggestions to fix something that was not broken. It is not the phone that is broken, it is the upgrade to iOS 9 that broke the phone, we should be able to revert back to the previous iOS when issues like these happen. I keep checking for additional patches for iOS 9 to fix the unresponsive screen issue, but no more patches lately.
It happens 4 or 5 times a day, you cant drag stuff around on the screen (it starts to move, then snaps back), or it does not recognize screen taps when trying to type on the screen keyboard, or trying to launch an app.