Hello, my LG G2 is having touch screen issues. I did all the steps in the troubleshooter except a hard reset. When I use the notepad, I can draw a line everywhere except about a half inch area near the top of the screen. Is there a fix for this other than getting a replacement phone? The phone is 5 months old and up until yesterday everything worked flawlessly. THe knock on feature doesn't work either. Thanks in advance for any help.