@Alexandre. thanks for your answer, but sorry, I have used some wrong words. Not my real neighbors, the family living next door, have the same network name, but Deco M4 generates a not password...

Hoi, I have purchased the DECO M4 via Ziggo and made an own network with a password protection. The installation of three Deco M4 units in the house went well and they are working correct But I have...