I have two separate SSIDs on my home network, one for 2.4 GHz and the other for 5 GHz. While iOS is programmed for both, I have always manually selected 5 GHz. Still, many times, I find iOS choose to connect to the 2.4 GHz network. Why is this happening and how do I prevent it? I usually notice this has happened because the connection becomes slow. I do not have this problem with macOS. Thanks for any help.