Update: the disruption has been fully resolved by Salesforce at 2:47 pm CEST on Sep 11.
At the moment there is a service disruption on the EU18 instance.
SERVICE DISRUPTION BEGAN
2:33 pm CEST, Sep 11
During a service disruption, end users are unable to access the service (org). The overall system is affected.
Status updates Salesforce EU18: https://status.salesforce.com/incidents/2655
As a customer you can subscribe to the Salesforce Trust Notificiations.
Go to https://trust.salesforce.com/en/trust/trust-notification-user-guide/ to subscribe.
"Trust Notifications are near real-time email notifications regarding incidents and maintenances posted to our Trust status site, https://status.salesforce.com. Anyone can self-subscribe to Trust Notifications and tailor their subscription settings to the instances and types of events of which they want to be notified. Trust Notifications are sent from firstname.lastname@example.org."