Multiple suppliers worldwide are experiencing problems with their services, which is also impacting Mollie's suppliers i.e. ABN Amro and Rabo bank. This is due to Akamai having problems with their Edge DNS servers. Which is one of the most widely used internet services in the world.
If you want to monitor this issue please check: https://edgedns.status.akamai.com/
We will update this status report when we have more information or when the issue is resolved.