I just had 2 relic hunt in a row crash my game.
I did a lv30 solo both times to quickly burn them, taking only Sara and Sakura.
Each time Sakura was the only hero I could take, and each time she hard crashed the game when she went to attack, at a random point in the battle.
Before these 2 that crashed, I did the exact same thing and it did not crash.
Please duplicate my Sakura and test.