Thanks for the details.  That really does help.   The node servers are verified every 5 minutes so that's probably not related, just that it is what you'll see in the log when PG3 is mostly idle.    But the reconnecting to MQTT broker is related.  That's saying that the network connection between the MQTT broker and PG3 dropped for some reason and it had to reconnect.  Most likely , that also means that the network connection between each node server and the MQTT broker also dropped an