@ChrisYo94 

I have exact same problem with my X75

Network Optimization never changes channels,

I reported to them and got no reply.

  @ChrisYo94 

You are supposed to see WiFi analyzer app WiFiman report WiFi interference/congestion on the channel occupied by Deco mesh, because all Deco units broadcast on that channel. They do it in the closest proximity to you, with the strongest signal.

Especially in places with little interference from other WiFi networks, all WiFi analyzer app sees is your network with multiple WiFi mesh units all using same WiFi channel. App makes a conclusion that this is the worst channel to be and suggests to change it.

You can't manually change WiFi channel in Deco mesh. If you could, the next time you run WiFi analyzer app it'll find that new channel you selected is now the most congested and will recommend to change it.