(Z8) Wat is this eror CF client error 18

skunkfu12984

can anybody tell me what is this error CF client error 18.I play ok for some time and then this error pops up and the game freeze and after a minute or two it send me back to lobby and all of my score is back to 0.I don't have this problem alone my clan buddy has it as well and his buddy too.(have a screen shot)