@_guofeng, We discussed same issue in multiple threads on the forum. As result of the discussions it seems that by whatever reason lights periodically (several times a day) drop IP and try to get it back from DHCP service on router (I have 5 Yeelight lights (450/480/650), and I see from the router log that they drop IP address and connection +/- simultaneously, within few minutes). In most cases they get IP back successfully (I assigned static IP for all devices on the router), but some times not. And if not - then I have to physically switch it off / on to restart.
I would be happy to participate in any testing / investigation to find out how this dhcp issue can be resolved (manual assignment of IP / new firmware testing, etc)/
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