iPhone 8 disconnects from wifi (All recommended steps taken to resolve with phone&router)

Ah, I've got the same router. I turned off the automatic selection because I'm a control freak. I doubt that the problem is the phone; more likely it's local Wi-Fi interference. I have the WiFi Explorer app that lets me view other local networks so I can see potential interference. Note that multiple routers can share the same channel within limits, so just the fact that routers overlap is not necessarily a problem in itself.

You can go to Settings/WiFi and "forget" the 2.4 network. However, you'd be better off forgetting the 5G band because it does not travel as far as 2.4 and obstructions (walls) impact it significantly.

In my case, only one WiFi network is available. The router automatically selects the better of the two bands and the operation is invisible to me.

If your router does not have different SSIDs for the two bands go into its settings and change the name of one of them so you can tell which is which. You can then connect to the one of choice. And see Philly's suggestion. If your property is large you might consider getting a mesh network.

By the way, this automatic band selection in the router is a feature offered by Comcast (but it must be enabled). If you have Comcast, give them a call and ask how to configure the router (it took me all of ten seconds but I forget how).

I just replaced my Optimum-provided router with a Netgear Nighthawk. Not only does it do automatic band selection, it can connect to two 5 GHZ bands simultaneously and dynamically route traffic to the one with better throughput.

Reading his latest post, Shadow apparently has the same/similar auto selecting router that you and I have. However, unlike us, his phone disconnects whenever the router switches. In my case I can't even detect the switch. I know which band is in use because, in some instances (like right now), I'm 3 feet from the router while, in other cases, I'm thirty feet away with four walls.

If this is possible, you might wish to turn off the 5G band on the router temporarily.

Local "Bluetooth" interference? Explain, please.

I meant Wi-Fi.

Thanks. I feel better now.

That's your second mistake this year. You've go to be more careful!

That's the only thing that I can think of that makes sense. Keep us updated.