Hi, so I've been playing for about four or three years and have never had this problem. The problem is when I play ML, my game would sometimes go black. It would take about a minute to restart or sometimes kick me off in general. The worst part is that it would usually cost me battles. The game would think I chickened out of the team war battle so I am stuck with 0 coins and it doesn't look right if my three level 105 monsters lost to level 60 monsters. This has been bothering me for the past 2 months and finally decided to report this since it still was going on. I hope they either completely fix the black screen or add an option to return to battle or forfeit when you log back in after leaving in the middle of a match. By the way, I play on a Samsung s6.
Thanks. - Vevxo