After the upgrade to 9.0.2 I have the same issue with NFS.
Most of the times after a reboot auto mount does not work but it works always after a manual restart of the systemd service.
CodeLoaded: loaded (/storage/.config/system.d/storage-videos.mount; enabled; vendor preset: disabled) Active: failed (Result: exit-code) since Thu 2019-04-11 19:28:42 EEST; 4 months 11 days ago Where: /storage/videos What: 192.168.1.10:/srv/nfs4/videos Apr 11 19:28:42 MainHTPC systemd[1]: Mounting nfs mount script for videos... Apr 11 19:28:42 MainHTPC mount[315]: mount: mounting 192.168.1.10:/srv/nfs4/videos on /storage/videos failed: Network is unreachable Apr 11 19:28:42 MainHTPC systemd[1]: storage-videos.mount: Mount process exited, code=exited, status=255/EXCEPTION Apr 11 19:28:42 MainHTPC systemd[1]: storage-videos.mount: Failed with result 'exit-code'. Apr 11 19:28:42 MainHTPC systemd[1]: Failed to mount nfs mount script for videos.Code[Unit] Description=nfs mount script for videos Requires=network-online.service After=network-online.service Before=kodi.service [Mount] What=192.168.1.10:/srv/nfs4/videos Where=/storage/videos Type=nfs [Install] WantedBy=multi-user.target
For me the issue seems to be caused by the firewall.
Since I disabled it auto mounts works on every boot.