This happened to the empegbbs.com search results a few weeks back, and I never heard a good response on what happened. Right now, I see 137 anonymous users on the board, so likely the spider is really trying to reindex everything again.

I'm tempted to just block google in the future if the drop the index on a regular basis. Whats the point of letting their spiders eat a ton of bandwidth if no good end result comes of it?