Every couple days, my Mac Mini Plex Server is going off-line (TeamViewer). When I get home to check, the Sleep Indicator Light pulsates on and off slowly indicating that my computer is sleeping. When I view the screen, my computer is at the login screen asking for my password which I thought I had disabled. I am thinking I should just install Caffeine, but I'm concerned that my external HD is not going to sleep while running. Furthermore, I don't think I should have to run Caffeine....it should just not sleep based on my settings right? Here are the screen shots of my settings. Any ideas?