iPhone changing wifi network on iPad?

[aces99]

i have a question and wondering if anyone else is experiencing this. I have two wifi networks in my house to cover all areas of my house. Let's say I have them named "Internet" and "Internet-5G". Let's say I have both the iPhone and IPad hooked to "Internet-5G". If I take my iPhone to the other end of the house where the signal gets weak and hook to "Internet" it changes the network on my iPad as well even though I don't want it to. Is there anyway to stop it so if I change wifi networks in my house on my iPhone or iPad that it doesn't automatically change it on the other. It is a pain to always have to check to make sure I am hooked to the proper network.