Disconnection in the game can be the result of various reasons, and to resolve this issue, you can check the following points:

-The quality of your internet connection:

The game requires a strong and stable internet connection, and any disruption, even for moments, can lead to issues in gameplay. Try using a different internet source with higher quality and check the problem.

-Opening your base on multiple devices simultaneously:

 Ensure closing your account in the game on other devices to avoid this issue. You can do this by switching accounts or starting a new game.

-Game version:

 Always ensure that you are using the most recent version of the game. Check for updates in your device's app store and update the game from within by using the "Check for Updates" option from settings.

-Device version:

Verify that your device's operating system is updated to the latest version through your device settings.

-Accumulated messages inside the base mailbox:
In this case, you have to delete all the unwanted messages to prevent any issues related to them.