for now it looks like an attack or a big farm jumping on and the KGW doesnt like that.
fwiw, i noticed that wafflepool had potcoin on their list of coins to mine within the last week, while the price of potcoin had spiked .. not sure if this is related to them mining the coin, but their multipool can be in the 40-45GH range easily
also,
we got hit by 45GH