That sounds eerily like this other post here... I suspect there's a weird zigbee bug that's hitting some of us -- it doesn't seem super widespread, but there have been a few similar posts around here lately.
I'm experiencing the same thing, so I'm hopeful a resolution will come soon.
Nyce 3041 Zigbee Motion Sensors Won't Pair - 
Get Help / Devices - Hubitat
ETA - dunno if v103 knocked something back in place or what, but I'm once again able to pair/add zigbee devices -- there is much rejoicing!
