Hey Dzozzi!
I apologize for the setbacks you are having with the constant crashing. There is a known bug that is meant to be fixed in a future update. This bug includes crashing when entering new routes, buildings, and battles. The temporary fix until the update is released is to turn off your background sound effects along with your background music at the main menu before loading into the game.
I hope this takes care of your frequent crashing until the next update release. If you have any further issues or would like to share your progress with the issue at hand, please reach back out.
-Hazegeek