Trackpad Button Doesn't Work Properly

I have a Samsung R580 laptop and the trackpad button doesn't work quite right. The button is a single piece button. The right clicking works just fine, but when I try to left click, it doesn't always work. I'll have to press really hard to get it to work. This has only started the last couple of weeks. I know that I probably shouldn't, but I take a thin knife and stick it in the crack surrounding the button and slide it back and forth a few times. This seems to fix the button momentarily, but only for a few seconds. After which, it goes right back to hardly working. I have no idea of what's wrong. I can use a mouse, but it's much more convienient to use the trackpad button. I can also use the trackpad it's self to tap which will do the same thing as clicking the button, but I keep clicking things I don't want to. Any ideas ? I don't know that the keyboard being dirty is causing it, as every other button works perfectly.

It sounds like you might actually need a trackpad repair or replacement. Are you still under warranty?