My 3 year old Macbook pro recently developed a rather annoying trackpad problem. The button appears to have lost its "tension." There is no longer a crisp click when I press it and it has a hard time registering clicks (especially in the middle of the button, there is slightly more tension on the sides but not much) and occasionally will click on its own. Could there be something stuck underneath the button, or is there a piece that provides the tension for the click that could be broken? Anyone have a similar experience?