Our DNS provider CloudFlare is having some issues in Atlanta (and a few other locations). Our main data center is in Atlanta and this might be causing service disruption. Also, there's a few countries where the issue is present the most (Germany, Spain, Sweeden).
You can follow https://www.cloudflarestatus.com/ for updates, there's nothing much that we can do about it on our end.
EDIT 10:00am: everything looks stable, NodePing is no longer reporting any issues for over an hour already.