Slush always has consistent luck, about 6 blocks a day average. I think they got DDOS'd yesterday. They payouts are increasing back up to normal.
DDoS attack sounds like a good explanation to me. Very strange when I saw that happen (and one of my S1's had a best share of around 453,xxxx,xxxx).
Anyhow, I have to see out my shift on the P2Pool node I switched to, plus that jump from 6PH to 9PH on the pool will definitely reduce my earnings .... so will see when we are done here.