@onkatr This is unusual. To eliminate possibility of Deco mesh misconfiguration, I would suggest switching it to Access Point mode and testing again. In Access Point mode Deco mesh just broadcasts...

@ram.sh >"Router"'s LED is steady green while the "Office" LED is flashing blue... Blinking blue may be a problem. Satellite Deco, just like Main Deco, will have solid green after it is properly...

@bubleponge This is the line that tells Main Deco loses connection, ignore the rest: Mon Aug 9 12:34:07 2021 daemon.notice conn-indicator: Connectivity changed: ONLINE(0x0) -> OFFLINE(0x1) It will be...

@ram.sh Would you please redraw your original picture with Main Deco (one that you named Router) and Office Deco, and repost it, for better understanding. I'd like to see where Main Deco and Office...

@Markup Your setup worked with Nexxt router, because you must have configured it as Wireless Repeater for your ISP Router. You can't do that with Deco mesh. What you have now is two independent...

@WouterP When you changed ISP, something else must have happened in your house that is coincided with it. Moving to different ISP can only impact link between Main Deco and ISP modem/router. Because...