My trackball is very erratic. Sometimes it works perfectly vertically and horizontally. At other times it will not work horizontally.
Since the problem is intermitent, is the source of the issue software or hardware related? I've tried reboots by removing the battery as suggested by tech support. The problem still exists.
How old is your phone? It's probably just dirty. There are "clean your trackball" threads over at BlackBerry. My solution was to just buy a new trackball unit on eBay ($12).
I have a blackberry 8350i for 3 weeks now.
I have the same problem!!
I think we'll have to get a third party or "atomic" trackball from somewhere.
Contrary to rumors, the new "Atomic" trackball on the 8900 is not any more reliable than previous models... As a contant replacer, this is quite unfortunate yet I'd still rather replace than go to a touch screen....