I've had my Blackberry since December 25th, 2011, and it's worked fine up until today. The trackpad won`t scroll, but still clicks. When I used to go into my settings to adjust the sensitivity, it said "Trackpad sensitivity" but now it says "Trackball sensitivity". I've taken the battery out, the SIM card, the memory card, etc., but it still won't work. When the problem started, whenever I touched the trackpad, the phone would freeze and restart. How do I fix it?