I hadn't had the clock switch on me in quite a while until yesterday! I haven't had the SDBus error ever since I started making sure I unplugged all usb devices before shutting the unit down. I don't know if that helps, it's just a hunch, lol! I have nothing to back it up. Wow, I'm going to study this really hard when I'm not tired. I really want to get rid of that bug. And thanks for the info on turning of usb charging.