I am seeing a competitor, who has been #1 for close to 2 years, drop to the mid 30's for a very competitive 2 word keyword.
This has just happened in the last couple of hours.
Luckily, our rankings are holding steady.
So I am guessing there has been some sort of a penalty racheted upwards in the last 24 hours.
Fasten your seatbelts, it could be a wild ride!