I was also a little bit upset yesterday but I am also using http://www.electroneum.space/ again because of the awesome community and payouts are fast > 10 ETN.

I do not think there are DDOS attacks. I think there are only sometimes som ETN network problems which results in Invalid shares. Admin think then that are DDOS but its not because the shares were actually valid but there is a problem with the Proxy or ETN network itself. Just my opinion about that or what I was able to see at my miners