Google is getting crazy against large websites. I am also experiencing huge decline in traffic.
After mid of march and start of april, I got 3rd shock from Google last friday, when our traffic goes down by 25% over the night. Till date we've loosed up to 45% of our traffic in comparison with january.
Google is crawling our website aggressively. I've noticed another thing that "site:" is not returning root page of our website as well as of some of our competitors websites.