NC 12.04 log error file_exists(): connect() failed: No route to host

cron.php produces 3x per run the following error message in the log file:
**file_exists(): connect() failed: No route to host at /var/www/html/nextcloud/apps/files_external/lib/Lib/Storage/StreamWrapper.php#74**
This is the only error message I get in the log
configuration:

Ubuntu 16.04, Nextcloud 12.04, external storage: samba, nextcloud 12.04, collabora 3, self hosting
Any help is appreciated.
Nextcloud is cool stuff