Thanks, found it. Fast roaming is enabled.

@tigercub The simple answer would be I don't know. Although the firmware of the Deco is up-to-date and also the App, I cannot find a setting "Fast Roaming".

Hello, In my home, I have a set of 4 Deco X20 units installed. The main unit in the corridor, close to the internet modem, one upstairs in the bedroom, one in the living room and one in the dining...