Ok, I have this aged 1 year old domain sometime ago. I built a steady amount of links everyday and it managed to get to the first SERP. Then for some strange reason, my site was sandboxed - no where to be found. Initially I thought it was a keyword ban since I couldn't find my sites when I google the keywords. Then later, it totally disappeared - whatever keywords I Googled, it's gone. So well, I just let it be... Then few days ago, I got several CB sales. I went to check my stats and found out that the visitors accessed my sites via Google. I type the keywords and sure enough, my site is back up! I was happy. To be safe, I didn't build anymore backlinks. Suddenly 2-3 days later, it disappeared again. Damn, wtf is wrong with G?