The bulb keeps disconnecting from the Zigbee network. Solution: Ensure the bulb is not too far from the gateway or another plugged-in bulb. Zigbee is a mesh; you need at least one device between the gateway and the distant bulb. Also, avoid placing the gateway near a metal electrical panel or a Wi-Fi router broadcasting on channel 11 (Zigbee conflicts with Wi-Fi; change your router channel to 1 or 6).
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