trades: Missing another move at GU

I have missed out this trade again. 06 September 2010, the GU is making a huge down move. No news or anything to amplify it; the price just move down like nobody business. My system manages to identify the move at beginning of the trend. As usual I am too busy at my day job to notice it. Too bad I have missed it, better luck next time. Below is the screen capture of the hourly chart.