Exactly the same thing happened a week ago to my non-gambling related site. I have not changed it, it is still indexed, not in the supplemental. Just a month ago the site finally got out of the sandbox, started to get 70% of the total traffic from Google. I was so happy about that, but the traffic from Google stopped as unexpextedly and suddenly as it appeared. Can’t understand what it was about? The sandbox does not let it go without a struggle?…Time will tell.