Subject: Error

Bug type:
Error =4

Map(Specific map):
Any

Game mode(Specific mode):
Any

Repeatability:
Sometimes - 50%

Operating System:
Windows 7 64bit

Description:
Sometimes after playing some matches and then entering new matches the loading screen for the match to begin gets stuck
for a while then it takes me back to the game room with an error that says "You´ve failed to start the game. (Error = 4)".
I´d like to get help on solving this problem and I want to know what the error means.
I would really appreciate if someone could help me out. I know that it doesn´t happen to a lot of players.

Steps to reproduce:
1) Play a few games.
2) Try to enter a new game.