I mine with hundreds of boxes and am being redirected to Google which I assume means that Slush thinks I'm DDoSing (I'm not, obviously; I mine well into the GH/s range)

The boxes use poclbm/Stratum and are redirected by Stratum to Google. I don't think this applies to my other accounts so I believe this is an account limitation? What got my flagged and how can I fix and/or prevent it in the future? I'm not doing anything wrong that I know of?