BLACKBERRY TRACKBALL/KEYBOARD ISSUES

Question

All of the sudden my blackberry trackball will not select- it will move up and down to the right and left but will not select...I am having to use the enter key.
Also, the A button will not work, the delete button will not work, and the return key next to the trackball will not work. The phone has been working absolutely fine and I cant imagine what happened.
Is there anything I can do to fix this???