When I am typing a message and make a mistake and want to scroll back to the left to correct it, it seems like at random places in the sentence as I'm scrolling it will shoot all the way back to the right where the line ends. Then I have to try to scroll back to the mistake and pray that it doesn't shoot back to the right again before I get to the mistake. Is this my trackball or is this a common problem and I maybe I should scroll slower?