Many players of Pokemon Go are reporting that they seem to be stuck in a "never-ending login" screen. It might be possible that it is another glitch of the game, or due to the fact that the some players have been banned.
On Reddit, a gamer MrTopHat7 assumed that he was permanently banned. However, he was able to get the problem solved with the help of some fellow gamers.
If you are in the same boat and have problems logging into your account, then check these steps that players need to resolve the issue.
On Reddit, player liehon reported that he had faced an never ending login screen which looked like the Pokeball got stuck spinning endlessly every time he tried to log into the game.
He also sometimes got an error message "humbled server" or "the game servers are experiencing issues" error. Even when there were no reports of server issues, he found that the problem was happening because his Pokemon Go account had somehow been desynchronized from his Google account, which barred him from logging in.
To fix the problem, liehon wrote that he had to remove his Google account and after doing, re-started the game. After this, he was asked to assign a Google account to his phone. At that point, he entered his original Google account again and let it sync with his phone including contacts, calendar and gallery. After these steps he was able to access his account again.
If you are still having problems logging in after trying the above fixation methods, other gamers have suggested logging out and forming a Pokemon Trainer Club account. Later, the user can log in with that account, use that account for playing for a while, and then log out and try log in again with their Google account.
A lot of people who are facing the unending login trouble are using Android version 4.4.4. That seems to be the core of some of the problems. If gamers are still having trouble after applying the Pokemon Trainer Club trick, another Redditor wrote a more complicated fixing method, that involves downloading the earlier .31 apk and repeating the login process multiple times till it stops failing.