Disconnected shows on controllers when they lose IPSEC tunnel with other controllers. You can check this with command “show control-cluster network ipsec tunnels“. One common reason for this is disk I/O latency. Check if there are no such alerts with command “show disk-latency-alert” or in the GUI in Actions > Fetch Disk Alerts on the Installation and Upgrade screen while selecting a controller.
That's a big help. Thank you. It's such a strange experience consulting and having
such restricted access. But I can be more focused in my ask of the admins armed