I was in an arena match, my phone hit 20% battery life and went into battery saver and closed the app. I turned that off and reopened the app and was back in the match. This happened like 7 turns earlier but I'm bringing it up on case it's a root cause.

My opponent is declaring attackers. It shows them declaring and then activating another card and then it just sits there for awhile it shows there timer running out, them using a timeout timer and eventually when that dies it all of a sudden shows that it's there turn again. My game state looks the same, same tapped creatures same hand, my life shows the damage I would have taken with no blocks but now it's there turn. I close and reopen the app and see the game is over and now I can see the updated game state with me having an additional card.

I had good wifi so it wasnt a connection issue. Was a weird bug that cost me a match I could have won :/