@Marvin_S hi, thanks for reply. I have the latest Deco app version on my mobile phone. Nothing has changed. It shows I have the latest Deco firmware, so do also site http://tplinkdeco.net/: Regarding...

The main question is: why do my Deco X20 devices lose their internet connection after restarting the ISP modem, despite the "Smart DHCP" option being disabled? My home network consists of one modem...