Just a follow-up here. I understand why powerline backhaul doesn't disable wifi backhaul (you have to plug it in nonetheless), but there should be an option to force which type you want to use. Say...

I've purchased 3 Deco P9 units a few days ago and set them up correctly and thoroughly via the app. Everything is working splendidly, however, the deco unit in my office keeps switching between the...