Your 2.4 GHz got interfere from others 2.4GHz near you. Because Deco use only 40 MHz for 2.4 GHz and we can't change that setting to 20 MHz.

Hello, Still hope to see 20Mhz default soon. Thank you.

Deco 2.4GHz 40MHz interfere my other 2.4 GHz tp-link router. And Deco 2.4GHz 40MHz itself has slower speed than 2.4GHz 20MHz setting

Setting you want to change are in Moblie app. Website page does not have that setting.

Hello, After many things change.For advance setting need both website setting and mobile app setting.

@Liam_T Thanks a lot. For my case, AX73 after last random reboot. AX73 online for 2 days. I do everything as usual. I don't understand now. But if AX73 reboot again. I will find new location for...