same deal with me
it stopped functioning properly after a long day in my (tight) jeans!
I tried to bend the BB "outward" and this seemed to help a little bit.
I bought a new trackball while troubleshooting this problem. what about taking the metal handle from the old trackball (the part that makes contact with the copper pad on the BB motherboard) and glueing it onto the new trackball - thus increasing it's width.
has anyone tried this?