I have a Samsung galaxy tab 4 10.1 and the screen or parts of the screen don't work anymore and neither will the back button or the button to see all pages at once. The home and lock button still work, I can't click on certain areas of the screen because they do not work, and wwhen I try typing it doublee taps ths letter even if I just xclixckeds on it once.. I was wondrjng if it was the screen itself or something on thee inside that ca be changed