This sounds like a case of using a cheap PoE splitter to power the hub. It will cause issues with the Z-Wave radio, suspect cause is unstable voltage being supplied.
In the hope that it will be useful to others, I thought I'd share my testing of the C8 powered via PoE.
There have been many references to issues when powering C7/C8 units using Unifi switches, but it should be understood that these issues are not specific to Unifi. My main switches are Cisco CBS 350s (192W), and while I had no issues powering C7s with inexpensive lightweight PoE splitters, the C8 has been a completely different story. FWIW, I've also tested with a dedicated Trendnet PoE switch…
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