Opening 1000 chests a time would likely cause your game to crash when you returned to the main screen, since the game is updating so many values once you leave the chest screen.
It's why we recommend only opening them 200 or 300 at a time, and then returning to the main screen in between.
Opening 1000 chests a time would likely cause your game to crash when you returned to the main screen, since the game is updating so many values once you leave the chest screen. It's why we recommend only opening them 200 or 300 at a time, and then returning to the main screen in between.