The game starts and I choose the card to keep or replace . The opponent is taking a while.
I thought hes just slow at choosing or afk ,but no after a few minutes i realise something is wrong (im doing other things or just listening to music at the same time) .
I try to “alt tab” (switching apps) but that doesnt do the trick (i waited a few seconds before going back to hearthstone)
, i can hear and see the opponent’s emotes . The only way i fixed it is restarting the app and its usualy too late… 
free win for the opponent . Its annoying but i think it only happened when i was playing Arena …
Playing on a Android phone (S7)
Using Mobile Data (LTE+ full bar)
happenned mutiple times (like twice a week although i do play everyday)