I'm a new user but have used Home Assistant in the past. I only have 2 z-wave devices and a couple automations set up so far. (Zooz switch and GE Enbrighten 40 amp switch)
I've updated the hub to the latest version and reserved an IP on my Google mesh router. The Hubitat is connected via ethernet to a switch.
Green light stays on but shows offline on my router devices list and is not reachable via IP or hubitat.local. Only way I can restart is unplug and plug back in and it comes up fine. I've enabled DHCP auto reconnect and set connection at fixed 100mbps instead of auto negotiate.
No significant changes to the network and no IPv6 devices but this has only been set up for a few days and has done this from the beginning.
Do you have any devices using jumbo frames on the same switch as the hub? The hub's network interface is known to drop its connection if it sees a broadcast jumbo frame packet. With symptoms that are identical what you describe.
For a quick fix, do you have any old fast ethernet switches? They are restricted to 100 mbps, which is adequate for the hub. Pertinently, they will drop any ethernet frames that are larger than 1518 bytes (i.e. they drop all jumbo frames).
To add what @aaiyar said, set your interface back to auto. Also realize that unplugging can cause database corruption. Just a warning. That said i would lean towards jumbo frames being on as well.
I would focus on switches (if managed) the router, and what. Devices like consoles or tv's or phones could be ignored. Anything hardwired is what you would want to check.
Ok, so it stayed up since my last post about 10 days...thought it was fixed but went down yesterday again. The only thing I changed was back to Auto-negotiate the connection and I disconnected my very basic Unraid server. Everything else connected to the switch is just game consoles, PS5 and Xbox then a Nvidia Shield and Anthem receiver.
Did a soft reset yesterday and now its down again...maybe lasted 24 hours. I did restore from a back up so if that matters? Maybe the switch or my router is a Google mesh system.
Ugh I might be going back to home assistant...I was hoping to at least use the hubitat for z-wave devices.
That behavior isn't normal or typical of how a Hubitat hub acts. Something is going on with your environment, your networking, or something specific to your hub.
I see @gopher.ny had looked into this a while back, but I don't see on this thread that he found anything or had you try things. That said, we can't see your private messages so I am not sure what happened through that channel.
Let me tag @bobbyD to see if there is anything he can do for you.
I can't get to the UI using the IP on port 8081...have not heard back from gopher. Maybe its the switch but I don't have another to try...the google router only has one port or 2 if I remember. I was looking to upgrade to Omada or Ubiquiti.
