I've only had this unit about a month and it has already randomly switched itself off at least a dozen times but thus far it has always re-booted from the power button. This time though it has shut down whilst in use and it seems to be permanent. The tablet was docked to the keyboard at the time and everytinhing seemd fine. Both batteries were at about 80% charge. I've tried re-booting with/without power connected to both the keyboard and the tablet. I have un-docked the tablet and tried the reset button. Nothing. Any ideas - before I box it up and send it back to Asus ?