Last week it was a specialized attack on the gg server. It is much more complex than a ddos attack but has the same effect however by turning off the gg server during the attack the other servers are not effected. Also note that the vast majority of the attacks have been targeted at the gg server. Due to how this has been going on for months and the costs involved in such attacks it is likely they are coming from another gg server. In the past when new servers got launched people would ddos all their competitors to try to draw traffic into their server. However, activity like this has not been seen in years. Still we and the data center continue to hand over logs and back traces to the feds.