Whenever I wake my chromebook from sleep the trackpad function is inoperable. There is no cursor displayed and using the trackpad does not appear to have any effect (i.e. no "invisible" cursor either). Upon reboot all trackpad function is restored. This started happening after I had been using my chromebook for a few months, so I'm guessing there was a software update associated with it, but I have no idea which one. Anyone else experienced this?