I installed Win 8 Preview on my two PCs and laptop months ago. Recently, all of them started having shutting down problem. when shutting down there were notice that windows isn't properly shut down, need to restart, then restarted. Sometimes it just restarted when shut down without any notice. It is now getting tricky to shut down, I did some step like disconnecting the internet, terminating all working program (usually I don't). It works once, but not at the next. Is it due to some updates, or something else?
Please share if you have the same problem.