logspout: Papertrail stops gettings logs after an hour

I’m running logspout on docker cloud with a volume mount of -v /var/run/docker.sock:/var/run/docker.sock and a command line arg to point to syslog://logs5.papertrailapp.com:3...

It runs for about an hour and then logs mysteriously stop appearing in papertrail.

Is there anything I can do to debug it?