The issue has been resolved. From our investigation it appears to have been a problem with the network on our server cluster. This caused a cascade of failures because of slow requests queueing up and taking servers out of rotation when they were otherwise healthy. We are discussing further with our servicer provider.
Posted Jun 11, 2019 - 11:52 CEST
The service is back now albeit slower than usual. We are investigating is happening.
Posted Jun 11, 2019 - 11:06 CEST
Servers are returning 503/504 errors sporadically. We are investigating.