Troubleshooting HA unavailable / disconnected several times daily

I’ve been running HA for the past 4 years. I’m always on latest stable version in a matter of days. Running on Pi 3 B+, and with Home Assistant OS.

In the recent couple of weeks, my HA has become unstable and goes missing few times daily, so things aren’t executed and when I open the app, it says HA is disconnected, as if it was in reboot sequence.

I would like some guidance on how to troubleshoot to figure out what is causing these outages. I’ve looked at the system logs, but there is too much in there and hard to get to anything that might cause a disconnect / restart. Is there any other way to get to the bottom of this?

You say raspbian image, in that case which install method did you use on top - Container (Docker) or Core (pip install)? Or, did you mean the Home Assistant OS image?

Depending on which you used you’ll have different options for troubleshooting this.

Sorry, I (think) I meant Core.

Operating System 9.0 … you run Home Assistant OS, no Raspbian involved.

Ok, great. So what are my options for troubleshooting this, then?

I don’t use or know HAOS so there’s not a lot I can do, other than point you at the various logs (HA and Supervisor) and to check that you’ve got sufficient power, as the Pi is known to suffer if you underpower it.

Could it be related latest duckdns issues? There are many posts in the forum about this and not sure if it is fully mitigated

I*ve been running with the same board and PS for years, so I doubt that is the issue. I’ve looked at the logs, but I can’t see anything that would suggest going into a restart, not even sure I’m seeing log entries prior to last startup.

No idea, but could that be eliminated by disabling the DuckDNS addon that renews the IP?

No, it is not about add-on which updates duckdns with your latest ip, it is about availability of duckdns. Duckdns itself has been having issues for last couple of days, so any external communication is failing here and there.

My home assistant android app, google assistant and alexa have been reporting these recently

Ok, I don’t think this should impact me, as I don’t have external incoming requests, and besides I’ve had this issue for a few weeks at least, so longer than Duck issues.

Is there anyone able to help out with diagnosing this?