I bought an Air today, and got it home and started it up, but about 10 minutes into use, the touchpad started playing up. Initially I assumed it was a little unsensitive, because it wasn't responding to my touches. But a few minutes later, the on-screen mouse started behaving erratically: moving fast around the screen, clicking stuff, and I couldn't control it at all. So I reset and solved the problem. For 10 minutes, until it started again. After about 5 restarts and repeated dodginess, I've decided it's faulty. Do you think this is guarantee covered? Has anyone else had this?