iphone jumps all over the screen
This doesn't happen all the time, but often when i type on my iphone it hits a bunch of different letters. Or when i am trying to log in and type the number 1, it will type the number 7 three different times, as an example. Or if I am trying to open an app, it will open another one and then press a bunch of buttons. It's like the screen has a mind of its own. Any ideas why this might be?
iPhone 5, iOS 8.3