[OBSOLETE] Original & Aqara Xiaomi Zigbee Sensors (contact, temp, motion, button, outlet, leak, etc)

Are you using any ZigBee devices that are mains-powered (plugged into a wall socket)?

If yes, then here’s the likely reason why:

Note that your Aqara Temp-Humidity sensor could have no issues because it is connected directly to your SmartThings Hub, rather than through a ZigBee repeater device.

Either way, I highly recommend having a look at this thread I started on the forums of another hub, Hubitat, which works very similarly to a SmartThings Hub and has the same potential for issues with Xiaomi / Aqara devices: