This morning I got out of the car to go to school and my phone started being slow. So I pressed the home button and I waited a couple seconds and then pressed the lock button. Then it took a screenshot. After that I went back on and it was being slow again and it wouldn't let me swipe to unlock so I pressed the home button and the lock screen at the same time to restart it. After it came back on I tried again but the same thing happened. Now when I try to go on my phone it will show half of the screen of what I'm supposed to be on and half of what I was previously on. What should I do? Or why is this happening?