Authentication Key and Repeated Log in
This isn't a new issue, but it is always made worse when you are forced to log in multiple times.
That being said, I am about at the point of removing my authentication key. Each time I get kicked out, I have to go through the task of entering in password, getting the phone, unlocking the phone, pulling up the app, and then entering the key.
Square should have already knowledge of me authenticating my account once I get past the login, and could verify it is me by my location and PC. Many services that require keys already have ways of making so you don't need to re-enter a new key for each and every log in.
I hope Square-Enix updates their security and makes it less of a nuisance in such situations.