Malfunctioning drivers will usually result in the game client freezing at random points during your gameplay, with the Windows error "BlackDesert64.exe has stopped working" or "BlackDesert64.exe is not responding" popping up. Begin troubleshooting the problem by using DDU to completely uninstall your current drivers. After you're done with this process, download and install the latest driver version available for your card.
NVIDIA drivers can be found here.
AMD drivers can be found here.