I have 5 sites I built about 2 months ago. I've been building links to them, nothing too crazy though. Mostly by hand. Anyway, they all dropped in traffic by about 50% at the same time. I started them at the same time though. But they are not related, they all have different links I'm building. They are on the same server though. Is this normal for a new site about that age, to drop off? Is this the sandbox?