I had a problem where my baremetal (6.1.3-8) became undiscoverable on the network following a reboot and would not pick up an ip address (according to the router).  Putting in a newly created bootloader USB made the device discoverable through Synology Assistant and find.synology.com, but was listed as "recoverable".  Clicking "recover" (the only option) started an immediate reboot which caused the diskstation to become undiscoverable again.     Symptoms: 1.  Diskstation disappear