My trackball button suddenly only works about 20% of the time - scrolling works fine but the button works about once per every 5 pushes. At the same time, the Alt key partially works - it works fine when used alone but Alt+"another key" commands like "num lock" and "application switch" do not work. Everything else seems to be working fine. I tried a Soft Reset, battery pull reset, and cleaned the trackball. Any ideas for a fix or is my BB toast?