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Posting this for reference.

I had 2 smart plugs working perfectly and I got a LB120 smart bulb to add to them but it kept becoming unresponsive and not connecting even after updating to the latest firmware (1.4.1).

I have a Virgin Media superhub router where the default wifi security was set to WPA Auto. This seems to be the problem.

I created a guest network and set the security to WPA2-PSK and connected the smart bulb to it. It has been working perfectly ever since.

Hope this helps someone.

toutski