At least for me, the issues I was having with logging in on my phone appear to be fixed.
For the past few months, ever since the update, I would get logged out whenever I hit the back button and whenever my iPhone auto-refreshed. It was super annoying because when I hit "reply" and it took me to the login page, it would take me to the main page after instead of back to the thread I was in.
Now, I have closed the page I've been on and reopened TK entirely new a few times over the past few days, and I have stayed logged in!
It appears something has changed for the better, so thank you!