Why is staying logged in difficult?? – T-Mobile DIGITS Review

No matter how many times I use or update this app the concept of logging in is apparently difficult for TMobile. It doesn't stay logged in if I don't use it for a few days even though this is the app that's supposed to tell me I'm getting messages and calls. Now when I try to log in with security questions it stays on loading forever. Why is login difficult guys???
Review by dd.fm on T-Mobile DIGITS.