I fixed it – this is a known issue with raspbian, maybe those excellent max2play people need to revisit how they set the fixed ip?
„The “faulty” is the dhcpcd daemon, which is a DHCP client that seems to be run before the parsing of the /etc/network/interfaces file.“
So I just added this to my /etc/dhcpcd.conf
# Custom static IP address for eth0. interface eth0 static ip_address=192.168.0.5/24 static routers=192.168.0.1 static domain_name_servers=192.168.0.1
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