I installed windows 10 yesterday on my Dell Venue 8 tablet. After that, when the tablet is left to itself, it shuts down and has to be restarted by pressing the power button twice. The first time the button has to be pressed and held for more tha 10-15 seconds. Then next time when it is pressed it restarts. It shows the DELL logo etc. With windows 8.1 it was working quite well.