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The only modes that I have been able to get into a match are Team Instant Action (team deathmatch) and Crash Site (where the alien capsule crashes and you get points if you/your team are in the radius of it and the enemy is not in the radius). And I will have repeated attempts at getting into either of them, and I will be the only one in the lobby. I'll back out and try again and again, and finally find a game in progress. It seems if you can get into a lobby with enough other players, you will be able to play match after match without issues (usually).