Cannot log in, takes multiple attempts

I try to log in on my computer, then I hit send a text code to my phone. It either goes right back to the login screen when I click send text or goes back to login screen after I enter the code. I have to try many times, empty browsing history, do it again. It's hit or miss, sometimes I can log right in, other times it gives me trouble. I need to have access to my email and account, this is becoming a headache. I have Phidium fiber optic knocking at my door offering free installation and great customer service...mocking Xfinity's customer service as a pitch. It's getting harder and harder to find a reason NOT to do it.

Now at one point I downloaded the app to my phone but quickly uninstalled it as it was giving me trouble, and that seems to be when the trouble started. I really hope this issue is being fixed.