Here's the latest from the hosting company.
"...Over the past few days A2 Hosting has been the target of several large-scale Distributed Denial of Service, or DDoS, attacks...
"...We believe these attacks are deliberately directed at A2 Hosting, as opposed to any particular customer.
"We regularly mitigate many small to medium-scale DDoS attacks without our customers even noticing. However, these recent attacks have been unprecedented in magnitude and therefore have been more difficult to deal with. Many of the recent attacks have been over 40Gbps in size with the largest being over 120Gbps. In comparison, the size of a typical DDoS attack tends to be around 1-2Gbps..."