@Celilo - Welcome to the Obsidian forum.
Sorry to hear you are having issues with the EN4. The support team will know best, but to help them can you provide some additional information.
What firmware version is installed on your EN4? If not, 3.0.1 you should update and try again.
Are you using a console to send sACN or PC? This should make no difference other than helping direct where to find /check settings. Also what version of ONYX (please list last four digits, current is not helpful when describing as a maintenance build is scheduled to be released soon).
As I think through node settings, make sure that sACN sync packets match on both the nodes and controllers (either enabled or disabled). As example on my setup they are disabled.
The nodes are a great product and what you described is not normal. Again, I would suggest starting with checking firmware. If you haven’t used the NETRON CLU utility yet, I would recommend downloading it and using it to upgrade the nodes. Once there, report back. Support may have a better response, but start with this until then.
Hope this helps,
Watson