Correlation is not (always) causation 
A Z-Wave device may cause, in rare situations, the Z-Wave radio to become unresponsive, but wouldn't cause the hub to drop off the network, or otherwise to stop working. Are you able to access the Diagnostic Tool? How are you pinging the hub? What does it take to bring the hub back online?
It is powered by the usb charger provided.
the only logs I have are devices reporting battery level every 12 or 24 hours or so.
no 3rd party apps.
no wifi devices.
all of them do power reporting except 1.
Hi, just posted it above.
My problem isn't lack of signal, but the device "hanging".
It is getting totally booted off the network then. If the platform just crashed ping should still respond and the diagnostic tool would still work on port 8081.
Need to know all of this:
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By power reporting I don't mean battery, I mean outlets that report voltage/wattage/amp use. They can be quite chatty.
Is all you have is 2 z-wave devices?
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As stated earlier it hangs. No ping, no diagnostic, nothing. Connected devices also stop working. Actually one day instead of restarting I let the device just remain crashed and checked the logs if there was any activity - like battery report. There wasn't any.
It is connected via wifi, not LAN as I had to mvoe the device to another room. Previously it was LAN. As I type this, I just realized, could it be that wifi is the issue?
@rlithgow1 Nope, I don't have any such devices.
This is what I have
1 zwave neo coolcam water sensor.
1 zwave water valve shut off econet.
2 zigbee water sensors - third reality.
It very much sounds like it. You should be able to test by switching to Ethernet connection. Would you be able to do that?
Seems like it may be a weak mesh. You could put some repeaters nearby the sensors and see if it helps.
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Yes I know. I said IF the platform had crashed then ping would still respond. I was stating that the issue is not a platform crash but actually a networking issue.
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@jtp10181 aah! I didn't know that. If it freezes again, I will use ehternet, so I can check out the ping.
That said, I tried the trick to swap the two antennas, and now it's been going strong for a week. I am gobsmacked why that even worked, but guess it did!
I restarted after a few days to see if it carries on again, and still working.
I am psoting this here, so the next person trying to fix this issue can find this.
But if it craps out again, and turns out it was a coincidence I will repost here.
Thank you all of you for the help. Very much appreciated.
I tried swapping the antennas and it has not crashed in a week. I am seriously surprised this worked, but looks like it did. If it keeps going for a month, that means it surely was the issue.
I really, really hope this isn't a coincidence.
Thank you!
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it means the original antenna was defective and should be replaced
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It would be great if HE would sell replacement antennas - I'd absolutely pick up a couple spares just to have on hand.
I had my hub disconnected the other day for some cleaning and I fumbled getting it back in place, and I realized a fall the wrong way onto a hard floor could end poorly for those antennas.
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I was having weird problems too i swapped the antennas and crazy as it sounds it worked for me too. Habitat really needs to sell placements!
I would put in a warranty request and see what happenes
The problem is that Z-wave operates in at 908.42 MHz in North America, and 868.42 MHz in Europe. Zigbee operates in the same 2.4 GHz band as WiFi. Technically, Zigbee is allowed to operate in the same bands as Z-wave, but that normally does not happen.
If you divide the 2.4 GHz frequency of Zigbee by the app. 900 MHz frequency of Z-wave, you get a ratio of approximately 2.7. While an antenna can be resonant at multiple frequencies, those frequencies must be harmonically related to the other band. This means the ratios must be 2, 3, 4, 5, 6, etc. Although 2.7 is "close to" 3, it is not close enough. It is close enough that you might be able to receive both band signals, it won't be close enough to efficiently transmit on both bands. That is why two separate antennas are required. Otherwise the radio would have to have a built-in tuner to compensate for a different SWR (standing wave ratio). Although use of an antenna tuner will match the transmitted signal to the mismatched antenna, there will be a loss of efficiency. The Hubitat could use the same antenna for both bands, but only by including an SWR compensating tuner circuit for one of the two bands. It is more efficient to have two antennas, each designed to operate at a specific band.
AFAIK both supplied antennas are identical. I have no idea how swapping them would have fixed the hub crashing, makes no logical sense.
Anyway... since you seem to know a lot about antennas, if you were to find some suitable replacements online and post about it I am sure a bunch of us could test them out and see how they work! I have been skeptical of the cellular style that work from 900Mhz-2.4ghz, but thats what other people have used.
