Some can be adjusted VERY little but just enough (search here for this) But yes, it can be one of several y these first.they're the easiest. Could be several things, reset the PRAM.also check the cycles on the battery under system information/power if it's REALLY high like near 1000 it could be a bloated battery which pushes up on the trackpad and keyboard and causes this.also check the adjustment screw for the trackpad.
