According to the Black Desert Online Twitter, the team is aware of issues with players experiencing overcrowding and with being disconnected after short periods of game play. To compensate for these issues, server capacity will be increasing soon.
@_Aethiru we are working on it, we are also increasing server capacity. Our Apologies for the hassle— Black Desert Online (@BDO_News) March 8, 2016
Thanks to WNxbadboy3 for the tip!