I am having the same issues. It doesn't matter if its plugged in or not plugged in. It shuts down completely after no activity for 20 seconds. I have all my settings to 5 hours. As long as I am working on it actively it stays on. I've tried all the suggestions on updates and all. It seems to be an issue for a lot of people. Is there a fix that can be suggested? The only thing I have left to do is to wipe it and start fresh. If there is something else I can do, I'd appreciate your help.
Interesting to note after some updates it acted ok for 1 day. Then it started acting up the very next day. I literally timed it. 20 seconds and it completely powers down. Please help. Thank you My email is ******@live.com