I have published multiple image services to our federated image server on our 10.5.1 Enterprise deployment. These were shared to "Everyone" in order to share to our internal network without requiring users to sign in to view the imagery. This works fine for a few days until my users report the imagery has disappeared. Checking server manager reveals that I am no longer the owner of the services (neither are the other admin accounts) and I cannot change the ownership nor can I see who the present owner is.

Is there a way to see who owns a service?
I have restarted the server and republished each of these services but this keeps happening. The image layers in Portal are shared appropriately to "Everyone" but the layers with these services can't be viewed except by signing in with admin credentials.
Any insights into this issue?
Goblins?