Now I know the stock Win 8 on Asus TF810C is heavily corrupted. I was never able to connect LiveUpdate (any version) and my tablet frequently died from deep sleep. A fresh install of Win 8 Pro (free from my university) solves both of the two issues! I can connect to LiveUpdate at anytime and my tablet never dies from sleep again (tested for several weeks now). No need to tweak anything to make it work. After four months of being tortured, I returned to the origin and finally solved the problem.