Same issue, moved from a Time-Warner area (no mobile wifi issues) to a new Spectrum account, keeps asking for wifi login while I'm driving thru different areas. Popup blocks my Waze map app. This is dangerous, I don't want to have to use my phone while I'm driving just to dismiss it. TW profile was deleted, why won't Spectrum wifi just login, or switch to cellular?
All of the users reporting the issue in this thread are using Apple iPhones. Has any of you asked the 'Apple Expert' at your local store about it? Spectrum has no control over how anyone's iPhone detects and switches to WiFi.
If the phone was running on Android OS, I would suggest
1) delete the Spectrum app completely;
2) clear the cache memory;
3) power down and restart the phone.
With an iPhone YMMV.