Hi, I bought a blackberry curve about a month ago and it's been working perfectly fine until 4 days ago. the trackball goes perfectly to the right and the left, but when i try scrolling down, it goes about 5 mm down and then shoots back up to the top of the page.

When I'm texting, the convo goes back up to the top and i can't text, same thing with bbm. I have difficulties going on msn or social networks.

I've tried rebooting it and cleaning and plugging in.

help please?
thanks!