Recently, some players have contacted us regarding an issue where some bubbles might disappear at random while playing a level. This issue can make it difficult for players to finish those levels.
Please note that we are aware of this issue, and we're working as quickly as we can to identify the cause and implement a fix.
We apologize for any inconvenience that this may cause you. Please be sure to update your game to the latest version so that you'll receive any fix as soon as it's available.