Yes, I’m using FreeDNS on a normal HASS installation on Raspbian, not hassos. The problem is described in the first post, FreeDNS is timing out very often when restarting Home Assistant. Changing the timeout of the module from 10 to 20 seconds should solve the problem, but I don’t know how to do this locally or who can update the module.
If you are running raspbian, and your ip does not get updated with the HA integration, why not run a cron job separate from HA ? There are numerous linux clients :