@TP-Link thx for the reply, i received also an email support ticket TKID220215759 on the issue. i am using a Deco X20-DSL from UAE, and i intend to add deco X60 units (purchased from US). i...

@TP-Link_Deco there is an issue with automatic selection, in my case it selects channel 13 and there are many wifi devices (especially from USA like smart LED bubs, smart light strips, wifi speakers,...