i can't seem to use the middle part of my trackpad, or the right side. the only section of the trackpad that seems to respond is the very left area. the middle area will maybe respond to my fingers for a few seconds before it doesnt respond at all. and with the right side, it too will respond for just a few seconds before not responding to my finger, and after it stops responding, the page will scroll up and down as if i had two fingers on the trackpad even though i'll only have one on it. has anyone else had this problem before?