This issue can occur due to an inconsistent network connection. Strong signal indications on the device do not always indicate that the internet connection is stable. In fact, even a slight fluctuation can disrupt the connection to the servers and affect gameplay.
This is usually a temporary issue. Follow the steps below and you should be able to log in to the game without any issues.
- Ensure that the device in connected to a strong and stable Wi-Fi network.
- Close all background applications and, if you are using an Android device, clear the cache.
- Ensure that the device has at least 2GB of free storage space.
- Restart the game.
- Ultimately, restart your device. It might sound simple, but sometimes that's all it takes to fix a bad connection.