sudden uneven screen brightness on 21 month old iPhone 5s
After running for 7 1/2 miles in one hour with my iPhone as I have done hundreds of times I could not get the Runkeeper app to stop the activity. I pressed the stop button over and over but it did not respond for about two minutes, finally it registered. Once I got back inside, I could see that the screen brightness was different at the bottom (where the activity stop button is).
The screen is brighter at the top and starting near the top left proceeding to near the bottom right in a jagged downward slope the screen is less bright (gray as opposed to white). I no longer seem to have any issue with the sensitivity of the touch screen.
I quit all apps and powered down the phone, but that did not change anything. I tried adjusting the screen brightness all the way up and then down but the pattern remained.
iPhone 5s, iOS 8.4.1