Unable to create / display devices


our ChirpsStack server comes into a state in which it is not possible to display or create devices.

An empty list of devices is displayed on the webpage after switching to an application.
For createing a device, the corresponding form was validly completed. On pressing the button ‘CREATE DEVICE’ nothing happens.
The get devices request via the API does not get an answer either.

The problem is cross-user and cross-organization.
After restarting the application server, everything works normally again.
The logs form application and network server show no corresponding messages.

Is there any reason why this would happen?