I’m on a Samsung Galaxy S10e, Android 11, and I’ve only been playing for a couple weeks. The last few days to a week, the game has been crashing a lot. At first it was only on startup (it might take half a dozen attempts to get the game to launch successfully), but now it’s sometimes crashing during gameplay after having been fine for a while. I’ve “lost” a few battles this way. The screen freezes, sometimes I hear multiple types of background music playing at once, and the next time I tap the screen, the app closes.
On a probably-unrelated note, the “Ultimate Fallfest Training Pack” doesn’t show a price for me, just a blank blue button. Pressing it doesn’t do anything.