I had to replace an installed antenna because it stopped having link in the ethernet port. It still boots from PoE and operates as SM normally but with no ethernet link it’s useless.
Is that usual, might be something related to the antena needing a reset?
Since the antenna is out of warranty I understand that the best thing to do is to send it to repair somewhere if it’a a hardware issue.
Sometimes the Ethernet port get corroded over time. Have you tried using that radio with a different ENET cable? Do you use dielectric grease inside your connections?