Not sure who else have experience this but let me give an example that happened to me.
When I was using “data” aka my phone cellular WiFi to play a game in arena its perfectly fine until you get home or anywhere that you already have WiFi automatically connects. The game would take ages to connect back stuck on the loading screen. When you try to refresh the app by exiting and reopening the game would disappear and would appear as a lost in your profile meaning the game would auto surrender for you.
Not a big issue but just would be better if the game doesn’t automatically surrender for you when you refresh the app/game and let you hop back on/reconnect to your arena match would be great.