It just keeps saying connection unstable, so I keep reconnecting

It just keeps saying connection unstable, so I keep reconnecting... I already downloaded several GB when I first installed it, and it took up almost 4GB after installation. Then, when I tried to start the game, it said I needed to download about 8-9GB more. This game is too bloated and heavy. I chose to download it slowly later. Once I created my character and was about to start the adventure, I couldn't even connect. An error message appeared: An error occurred during the initial update.