Good morning and thank you for posting on the Final Fantasy XIV Technical Support Forums.

This forum in particular is for technical support for the game, as such, support for the companion app will be a bit more limited. However, we do have a few suggestions regarding crashes for the app (it looks like some of you have already tried some of these but I make a full list so everyone can troubleshoot the issue).

1) Close all other applications running in the background.
2) Delete your web browser's history, cookies and cache.
3) Errors are more likely to occur when devices have little free storage space. Consider removing any unnecessary app, images, music, etc.
4) Try turning off your device for a few minutes, then restart it.
5) Reinstall the app.

For Android devices only:
Make sure to clear the cache and data from the Google Play Store application

For IOS devices only:
Go to 'Safari' and in the 'Settings' menu, delete your history, cookies and cache.

If you continue having this problem after doing the above suggestions, please let us know so we can look into the issue.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!