I had my Asus Zenbook for about 1 year when the problem started. I finished working and put the laptop to sleep. When I came back a few hours later as I open the screen it switched on but as soon as the screen got to about 40% open it went back to sleep. I closed the screen but when it got back to the 40% position, it started up. It has full functionality when it is on at the limited screen open position so I did a full shut down and re-started but the problem still exists.