I bought a blackbook on tuesday night. I have heard of random shutdowns. a box pops up asking if i am sure i want to log out and close all my applications, has a 60 second count down. This window generally pops up when i am watching video such as VOD FROM CBS.com or after a few minutes if i am not using the commuter agressivly, (i.e. typing) if i am reading and scrolling or watching video it pops up. is this common? if so how to fix it. I thought it was me clicking on the tab in energy saver that says put HDD to sleep when ever possible. but i since unchecked that box and it still happens.