I would say 4/5 attempts at fighting result in freezing in the first few seconds, and then the game refuses to load at all until the arena timer(5min?) runs down. It doesn’t matter if it’s the regular arena or local battle challenges.
I’ve uninstalled/reinstalled, cleared cache, I’ve made sure no extra apps are running at the same time, I even fully reset my phone thinking a memory issue.
NOTHING has fixed it. I’m thinking it’s a game issue and possibly too many people trying to fight an arena at the same time.