Unknown error code

I'm getting the exact same unknown error now when trying to connect to a multi-player game.  This games been nothing but frustrating.  Game disconnects when it goes to load the next map, random screen freezes and I have to close BF1 down with Windows Task Manager then re-launch it.  It goes on and on.  I want to like this game but it is riddled with bugs.  I'm not expecting a solution even though I paid $120 for this game.

wellcome to the angry customers club :D https://forums.battlefield.com/en-us/discussion/38131/directx-function-error-nvidia-still-no-fix-do-you-care-22-11-16-18-57-cest/p418

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@slotterman20 wrote:
Can't connect in matchmaking in battlefield 1 keeps saying unknown error

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Does this only happen in Operations or in every game mode?  If it only happens in operations, when you receive the unknown error message it means that the server is full. In order to fix it you have to make a new party and join a new server again.