my mouse keeps moving by itself

I have had this issue for months and it is finally resolved.

I talked to an employee at Apple btw.

First thing:

shut down your computer and unplug everything except for your power adapter

hold shift control option and the power button for 5 seconds

~ This will reset the system power management control

Second thing:

Go to the hourglass in the upper right corner

Search disk

Click on disk utility

On the right select Mac HD

Click verfiy disk permissions

Click repair

This repairs any problems on your hardrive

These two steps did the trick for me! And I hope they do for you as well.