Getting "DNS_PROBE_FINISHED_NXDOMAIN" for my domains (managed in Netlify's DNS) and admin dashboard isn't loading

All my sites that are hosted in Netlify and associated with my account are suddenly overnight inaccessible.

For example:

When accessing getting “DNS_PROBE_FINISHED_NXDOMAIN” error:

Also unable to log in into my Netlify account, something appears to be broken:

After refresh it goes back to login page.

Please advice.

Has anyone encountered such problem?

This seems to have been resolved in the helpdesk.