Time passed but bugs remain for months

Every week, in 3x3 arene, I lose 2 or 3 fights without fighting and even without seeing the opponent. The game freeze on the loading screen, I  have to relaunch the game and the  fight is lost 0-3.

This is very annoying because there is a mission to reach Gold1 in 3x3 arena. This mission is difficult for me and losing 60 to 90 points is very important.

I'm playing on an iPhone12 with last version of iOS.