weird trackball issue

so i changed the battery in my tour to a new 2600 extended battery and i've been coming across this problem pretty occasionally where the trackball works fine in all directions but going left.. then when i open the battery door, it works fine again.. and i can put the battery door back on and it will work fine for some time until the same problem comes up again... any ideas? this is so weird.

It's probably dirty, check out this video on how to clean your trackball with a piece of paper only. This is cool...

http://forums.crackberry.com/f141/my...hlight=kingzee

i did clean it... but i don't think that's the problem because like i said, as soon as i take the battery cover off, problem is gone and i am able to scroll left again.