Cannot play the game. "Network Disconnected" issue

Hi,
I was able to play the game without any issues until two days ago. While playing two days ago, the game kicked me back to the main menu several times without showing any error message. After that, I started getting a “Network Disconnected” error and couldn’t log into the game.
I searched online for a while and tried every possible solution I could find. The only thing that worked was restarting my modem and changing my DNS settings to 8.8.8.8 and 8.8.4.4.
However, today I’m getting the same error again and haven’t been able to find any solution.