I've been having an odd issue with my Air lately. Out of the blue, the trackpad has become incredibly jumpy. It stops and starts, does not pick up all the fingers all the time, and occasionally jumps around and taps when it's not being touched. I have tried rebooting, a PRAM reset, and an SMC reset, and it is not becoming any better. Rebooting the machine into the recovery partition and Windows reveals the same issue. The keyboard works perfectly fine. Has anyone experienced this before, and what's might you have done to fix it? Many thanks --- Post Merged, Jun 30, 2017 --- Update: The trackpad seems to be completely and utterly unresponsive now. Also, it works perfectly with an external mouse.