The Cox Wifi APP not working.

I just got a brand new router from cox which has three bands wifi. I don't know why my bands keep changed or not found at all which is annoy, but also when I open and log in to the cox wifi app, I try to change the names for the bands or closed one of the bands, keep said something went wrong. Now my house wifi only has one band which is 2.4ghz not 5ghz or 6ghz.