Me to the same bro. All others games played in my device but not arcane legends when this problem started.
Because I have the iPod touch with the same specifications I tried to play and the game works just fine.
I don’t tell you to replace your battery, only have a look with one battery checking program to see how really working your battery.
My test showed to me that the cpu was throttling to 50% after the 70% of the battery .
The game was green ping stable, the chat in game was goes extremely slow, and the game unplayable.
After replacing the battery and using the same iOS version my problem fixed.
I hope to find a solution to your problem.
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