There was a general issue with the latest Update on ARK PS4. This was fixed yesterday by Wildcard and was pushed to our servers immediately.
Unfortunately, an issue on our side prevented servers from being able to start/stop/restart, this has been fixed and all servers are up and running again.
If your server has lost any data or rolled back, please try to restore a game internal backup which was created before the update was released.
We are really sorry for the inconveniences caused.