This is my first post so if this is the wrong place for it let me know. We have the following issue with our app. Our ios build (on El Capitan with xcode 7.2.1) works most of the times after you install it.
But for some reason sometimes when I install it on an device, it gets stuck on our login screen (the first view of the app). Clicking on elements in the login form does not work, the keyboard is not appearing and the buttons on the login screen are also not working. Once this happens the app remains broken even if one kills it and restarts it.
Reinstalling the app several times solves the issue (at the moment the installation is done using testflight as we are still testing). Could anybody give me some guidance on how to debug this?