IPhone Wi-Fi forgetting network?

How do I stop my iPhone 6 plus from connecting automatically (when Wi-Fi is enabled) to a particular network? My gateway has both 2.4ghz and 5ghz and I don't want it connecting to the 2.4 one because it's very slow. I have Comcast by the way. Whenever I forget network it forgets the 5ghz one too.

Settings > Wi-Fi > Select the 2.4 Network > Forget This Network I have the same internet as you do, and the same phone. Once you forget it, if it forgets the 5ghz one too, then select the 5ghz and type in the password, being sure not to type it in for the 2.4.

Forget the network

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