Display ethernet doesn't find IP, but does work with manual IP

My MacBook Pro is connected to my thunderbolt display. Recently the display ethernet stopped working. When I set the setting on 'Using DHCP' it doesn't find an IP address. I can select 'Using DHCP with manual address' and choose a random IP address and it works fine. The wifi also works fine (so that does find an IP address using DHCP...).
Any ideas how to solve this? Is it a mac or a router problem?
Thanks in advance,
Rugen Heidbuchel

If you remove display ethernet in the Network menu then add it back in does it find the IP address?

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