Fixed DHCP address breaks connection unrecoverable

Hi, thanks for your response.
To be clear, my router does not do the DHCP. I have an ISC DHCP server set up in my network which runs independently from the router. All the DHCP clients in my network already get 8.8.8.8 as DNS server.
But to answer the question, the router model is an AVM FritzBox 7490.

Could it be an issue that I am configuring my local domain as well when answering the DHCP request?

Sep 11 16:43:30 fry dhcpd: DHCPDISCOVER from 78:11:dc:a2:27:4c via eth0
Sep 11 16:43:30 fry dhcpd: DHCPOFFER on 192.168.2.201 to 78:11:dc:a2:27:4c via eth0
Sep 11 16:43:30 fry dhcpd: DHCPREQUEST for 192.168.2.201 (192.168.2.51) from 78:11:dc:a2:27:4c via eth0
Sep 11 16:43:30 fry dhcpd: DHCPACK on 192.168.2.201 to 78:11:dc:a2:27:4c via eth0
Sep 11 16:43:30 fry dhcpd: Added new forward map from yeelink-light-strip1_miio77096853.home.lan. to 192.168.2.201
Sep 11 16:43:30 fry dhcpd: Added reverse map from 201.2.168.192.in-addr.arpa. to yeelink-light-strip1_miio77096853.home.lan.

Thats how the fixed address looks in the config:
host yeelight-strip1 {
hardware ethernet 78:11:dc:a2:27:4c;
fixed-address 192.168.2.201;
option domain-name-servers 8.8.8.8;
}

Cheers!