There is a conflict that has been discovered in GhostBSD 18.10 and 18.12, it got more visible in 18.12. While working on the next release I have discover the conflict. The package dhcpcd conflict with the dhcpcd in the base. The conflict causes some problem to create /etc/resolv.conf, it also causes some issue with networks card to crash on network restart and on resume from suspend.
To fix the issue permanently dhcpcd package need to be uninstalled:
sudo pkg delete dhcpcd