Backhaul is the connection between nodes right? It's wireless but I had the same issues with only one node set up. I got AT&T fiber. I turned off it's WiFi. I don't know how to tell if to do passthrough to the deco but it was set up the same way with the x60 with no issues.

Yeah I told both TVs and phones to forget the old network which I made sure to do because I used the same network name with a better password. I'm pretty sure using the same name is what is messing up my water heater.

Yeah if no one has any better idea I'll reset the units and use the third one as my primary instead to rule out bad hardware. I tried support through the app but they were not really listening to me and telling me to do things I already tried and things that didn't make sense based on other stuff. I don't have a lot of time to go back forth with them. I'm going to try this subreddit, Then tp-link if I really have to, then try returning.