People are reporting this everywhere. Smartthings Hub V2
This has something to do with the Firmware update. I lost a few zigbee devices my father lost a couple zigbee devices. Don’t remove them you can’t get them to discover again. I have brand new spare zigbee devices and the hubs can’t discover them none of them even laid them right next to hub. I’ve tried at my house and my fathers. Seems they broke something with zigbee. What’s strange is some zigbee are still connected and working. Hope they fix this soon. These went off line 2 days ago just showed unavailable.