The error you are facing is due to not detaching the old cluster, which is terminated/auto-terminated and when you run a cluster that connected to new cluster with same name and config. Which notebook tries to connect to old cluster which is still not deleted and just terminated with new cluster under same name, which makes the notebook run under work cluster which is terminated.
Solution: detach old cluster from notebook and reload the web_page, you can see only new cluster but not both at a time as below. Now attach the new cluster and run your notebook.
detach old cluster
reload the page, you can see only new cluster
Now attach the new cluster and run your notebook.
