Sounds like the openVPN connect launch daemon is not working.
Can you run the following command in the terminal and see if you get an output:
sudo launchctl list | grep org.openvpn.client
If there are no outputs then you can try loading it manually via the command:
sudo launchctl load /Library/LaunchDaemons/org.openvpn.client.plist
But, in case if it will stop working again you may want to check if there is any other 3rd party application that is preventing the ovpn client agent from starting.