How is hub being powered? PoE is known to sometimes cause z-wave issues. Recommendation is to use the supplied block and cord or some other high quality USB-A 1-Amp or greater supply.
Also you could try swapping the antennas, sometimes one is faulty so swapping them could fix z-wave but then cause zigbee issues, but at least you would know the problem.
Here is the full list of suggestions from the READ FIRST topic
