I was using my macbook air today (2013 version) and I stopped, and then when I used it again later in the day the trackpad isn't clicking properly. It still registers clicks just fine but it just isn't clicking the way that it used to from a mechanical perspective. I am not sure why this is happening but I was wondering if anyone has any ideas to repair this or if not how much it costs to buy a new trackpad (I can install myself without issue)