Just wanted to confirm receipt of your Deployment ID info over message. I'm going to get one of the Crawler team members to take a peek when they get a moment. I was able to confirm seeing the "Unexpected error ... " log message, but I don't have a good idea on how to resolve just yet.
Also, I should've asked for clarification on this earlier, but when you say:
... when trying to crawl a list of 1000 sites
Do you really mean you've configured 1000 domains to be crawled, or rather did you mean you're crawling a domain that you expect to have about 1000 pages contained within it?