Unfortunately, this seems to be some of these problematic Zigbee 3.0 new devices that will not stay connected to Hubitat hubs, There are dozens of similar problems reported in the past year, but there is no solution yet.
What was working OK was the old _TZE200_nklqjk62 Zigbee board, now the same device, from the same manufacturer, but using the new _TZE204_nklqjk62 Zigbee SoC will not work in HE.