PS4 Caspian Border Map Doesn't Load

This has happened to me as well trying to join conquest large caspian. The game would stay on the loading screen for long than usual and then a black screen comes up withou the loading sign on the top right. Just a blank black screen and nothing else and it stays there. Tried turning off my ps4 and all that but the same problem kept happening. My friends were in the game so I just finished till the game was over and I joined in the next map metro.