Took a long time to get here, but we have discovered a bug in the switch software that caused devices with certain mac addresses to fail when they were connected over ethernet. It is probable that your issue is the same. We have released a firmware update that should address this problem, please update your SENSE and give it another try. Let us know if the Apple TV works normally over ethernet again.
The fixed update is 2018-01-29_01 - p.22.214.171.124
... View more