Just wanted to provide an update and confirm that the issue has been resolved. I found a couple of devices on the vlan with Jumboframes still enabled. I disabled that setting and rebooted everything and I haven't had a single issue. While I eat crow - I'd like to thank everyone here for their suggestions.
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Glad you found the issue...
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Its too bad the hub crashes when it sees jumbo frames, one would think it could just ignore the packets, but I really have no idea what happens at that level of hardware/firmware. Might be something with the hardware being used and they have no control over it 
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I have the same or a similar issue and afaik there are no jumbo frames. Only 2 zwave devices so I’ll try the factory reboot. Hoping it’s not an issue requiring a replacement of my GE/Jasco switches.
With only 2 zwave devices it probably has nothing to do with zwave at all.
If you can still access the diagnostics tool (port 8081) when it goes down then it is probably a hub issue. If the port 8081 is also unreachable it is a networking issue on your LAN.
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Can't access the diagnostic tool. I reset the network settings from static to DHCP, even though I was pretty sure I don't have a conflict. My only DNS router-wide is 8.8.8.8. There are no jumbo frames. I don't have a pi-hole enabled. The logs aren't helpful.
In network settings you could try tuning on the auto reconnection option. This would help if the hub is simply getting disconnected for some reason.
As a test, if you have an old dumb 100mbps switch around you could attach the hub through that which someone else has stated would filter out any jumbo frame packets.
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I have auto reconnect set to 30s. It's been set to off before. Both settings don't seem to affect the issue.
Please send me a private message, I'd like to take a look at your hub's engineering log to make sure you are not dealing with some sort of hardware malfunction.
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