@Kaiyuan Sorry to hear that you have some difficulty with the Deco M9 plus, we will do some troubleshooting first to fix it. 1. What about other devices which connect to the main Deco? Do they lose...

@Kaczo Glad to hear that it was resolved finally. Congrats ^_^ Any further problem, just let us know.

@roytanck Per Iconic said, devices that won't move around, like cameras and fixed TV's or the devices need to connect to some single band only, like some smart home devices.

@Ixnay Definitely sure.

@Ned01 Thanks for your reply, glad to hear that it was resolved finally. Any further problem, do not hesitate to contact us. Nice day.

@Matti Thanks for your reply, glad to hear that they are working properly. You can refer to the user guide for more information. https://www.tp-link.com/support/download/deco-m5/