I got my 9330 about 6 months ago. For the last 2 months, I've had intermittent problems with the thing scrolling up, out of control. I can't type an e-mail, text or look at the web without a constant fight of trying to keep the cursor at the spot that I need it.
I have rebooted. I have downloaded and upgraded my software. Nothing works.
My frustration level is pretty high. If you have a solution other than those things, I'll try anything.
The problem is that dirt and grease may get into the scroll ball and then transfers to the contacts inside. That's why a firm push and scroll usually solves it. If that solution doesn’t fix then please visit our Sprint Repair Center to Service the phone.
I had the same exact problem. I tried everything to fix it. I read somewhere that someone never had this problem until they updated their facebook app. I have facebook and I probably updated it too. I logged out of facebook on my phone. I also reduced trackball sensitivity to 20 both vertical and horizontal, and reduced my backlight brightness to 10. Then I did a battery pull. Now my Curve 3G is back on track. I could not believe it really worked. I have since logged back into facebook on my phone and things are still running smoothly.