Over the last week, there have been a large increase in the number of server issues. Players on popular servers such as Area 52 for NA and Tarren Mill for EU have experienced server issues during Prime Time hours.
Edit #1 (7:18 PM PT): It looks like servers are being shut down around 7:30 PM.
The most recent outage seems to have occurred recently on NA servers and seemed to affect more servers than the previous issues.