I am having some issues with my settings in System Preferences settings in Universal Access, Mouse & Trackpad. I checked "Mouse Keys" off and "ignore built-in track pad when Mouse Keys is on". I made these settings so I can turn off the trackpad by clicking the alt option key 5 times. But every few days for so, the "ignore built-in track pad when Mouse Keys is on", gets unchecked all by itself. Anyone know why this is happening?