I'm having a similar problem since last night, where it crashes whenever I get to the main menu after logging in. But if I go in settings and clear data for arcane legends, the game doesn't crash, but I have to do this every time before I go on the game. Thought it was something to do with storage but I got 76 GB free on my phone. Samsung released an update that I installed yesterday so I don't know if its something to do with that?