Sound like the trackpad adjustment screw can be not adjusted right. Try to adjust the screw that is under the battery. I have done that a lot and it has fixed it. Or it can be the battery is old or has expanded and pressing up on the track pad. I would remove the battery and see if it works.
Have you all done the new update? I know the new Update fixed a lot of problems with that. Also might want to try a can of air and try to blow out under the button. sounds like it is a keyboard problem many people are having. Keep eyes open for a recall.
Have ou try to Reset the PRAM and VRAM? That can cause a lot of problem if there not working right. Also do a backup and Might want to do a Factory Reinstall.
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