Game disconnected: client closed down connection. DURING GAME.

im unable to join any servers that have people in them. when i try to join one it claims to be joining and goes to connecting but then the bar at the bottom of battlelog turns red and says "Error  game disconnected: client closed down connection." and if i click on the bf4 logo on the task bar it opens up to a black screen with a white bar in the top right corner moving up and down (i would assume its a loading bar type thing) but that closes itself when the error comes up on battlelog.  i cant figure out what the issue is because i am able to join empty servers and people can join n itll still work. but i am able to play the SP campaign with no problems.