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I had to change my SSID's on my 5Ghz and 2.8Ghz WiFi because Macs used to confuse themselves and constantly disconnect.

Using the same name for both didn't work

Your problem is using the same SSID for both frequencies. Have a single SSID for all your 5Ghz APs and another for the 2.4Ghz ones.

That's the opposite of what this article says to do, which I think is why the above commenter mentioned it.