Was there anything you’ve done recently in the networking space like changing its static IP address, or adding a new network device to the box (or are you using bonded interfaces)? Or installation of additional Rockons?
@Flox some time ago (and on an older version) pointed out some of the context on where this might be occurring, but also the difficulty to pinpoint what causes this situation:
Also, did you perform a reboot? In another instance of this error, it seemed to have fixed the issue.