Board Thread:General Discussion/@comment-31657976-20180529230533/@comment-5138166-20180530000809

All that can be suggested is to keep trying.

Supposedly, there is a file that the game uses which is on a timer. If the data doesn't download within the specified frame, the whole thing has to restart.

https://www.reddit.com/r/DBZDokkanBattle/comments/87qjuq/global_my_investigation_about_the_download_failed/?ref=share&ref_source=link