kind of solved it myself.
EUCON 3.2 doesn't support configurations with bonded ethernet connections on mac anymore (VLANs etc...).
thank you avid. instead of fixing the connection issues, we sometimes had with pre 3.2 you just kicked support for one of the most common ethernet configuration used in post houses...
now I have to use a thunderbolt or USB to ethernet adapter to use my eucon devices. took me the whole day to figure that out.