Desribe the tip:
So, if your game goes from running well to lagging like crazy, that’s an indication that your battery is almost dead and you need to charge your phone you numpty. And since you can’t see the battery life of your phone while in a game (without swiping down on the screen itself) and the game is intense as it is, keep mindful of your charge or else you too may find yourself losing a match to a black screen 
. Good luck guys!
What’s your Phone/Model?
IPhone 6