Every so often, usually once per day, I will be using my phone and it will, without my touching, swipe around and puch buttons on the keyboard and I will have absolutely no control and it has sent weird messages to my friends. This is the weirdest thing I have seen on a phone. This wasn't a problem before, but I cracked my screen and took it to a repair shop (my parents would let me repair it myself) and when I got it back this glitch started happening. Does anybody know what this is and what I can do? I am very confused.