App closes

I've got a problem with the app closes after a fight, i've got this problem since the update, but seems to be getting worse. I try to do some arena grinding but if the app closes and have to restart every 5 minutes, its not going very quick. There are more people in my alliance who have the same problem and we're probably not the only ones. Is someone trying to fix this?? Or do we have to get used to doing 10 fights an hour in arena?
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