Have you tried updating the firmware?
Its not a fake, its a US model.
Odds are that its running old buggy firmware, so upgrading it will improve it (dramatically in some instances).
Current OS version as of 12th Oct was/is:
BlackBerry Handheld
Software v4.5.0.294 (Multilanguage) RELEASED 10-12-09
Package Version: 4.5.0.294
Consisting of:
* Applications: 4.5.0.174
* Software Platform: 2.7.0.105
* File name: 8320M_PBr4.5.0_rel294_PL2.7.0.105_A4.5.0.174_.exe
* File size: 92.43MB
This URL may be useful to you -
http://forums.tmonews.com/index.php?topic=11472.0
I'd suggest read about upgrading before you do so, and write down your current software version (perhaps in this forum?) so we know what you currently have.
I'm not sure if BlackBerry still does regional firmware, so you may need to download a firmware from Hutchinson or another similar HK provider if you install that and lose Chinese input / language capabilities.
Hence my advice to let us/me know what you have first.
Trackball is probably just dirty, get a little bit of alcohol, and wipe the ball.
I though the new ones used a touch pad though?
Lawrence.