The last maintenance was to add an additional server for load balancing and critical services that were being affected by the DDoS. The DDoS is still ongoing, and depending on region you live in you may be affected by the mitigation service. Other than the steps we've taken, the next option is to add an additional layer mitigation, but that may be problematic for people in areas that are high risk for DDoS botnets.
You can try doing a tracert, and see where the issue with ping is happening or try using a VPN, which may help by lessening the hops you have to the server, or by bypassing the mitigation service.