Arena technical problems

Playing hearthstone mobile,there is regullar problem on arena. Normally, when you starting a new game,there is some roll on red background,then when opponent is here the button"back" disappeare and in few seconds game start. But sometimes there, the button back is disappear and the roll is keep going, just like game is freezed. This times i can only check FL and settings, not even go back to main menu. All i can do is restart the app, and when i came back i just get a lose!

Damn, problem N2 nust appeared right now, looks a bit same ingame, i attacked an enemy minion with my one, and game just stucked, can only open friend list and settings, no play any card, not even end the turn. And it stays like that already for few minutes. Final t
Result 1:3 arena without any reason. It really makes me mad!

Meizu C9
Android 8.1.0