@Wayne-TP 

Thanks for your answer.

My network run on Unifi devices, 10 AP (big house and garden). It is a mesh network, same SSID.

L630 choose an AP after a powercut and don't move from it. It is not always the nearest.

I can't make them move like my other IoT devices, i mean when a light from another brand is on an AP, if i lock it to another AP the device is disconnected from the Wifi and reconnect to the choosen AP. The L630 just stay offline until i remove the lock.