what is STAGING_DIR on the target server?
the error indicates that the STAGING_DIR is set to a swap location - probably /tmp - so if we push files into that directory, then reboot, those files will not be there anymore. even if the payloads are on a nfs location, there are still files put down in the staging directory during the deploy. you should change the STAGING_DIR value on this server to somewhere that is not swap. eg /var/tmp/stage.