Every time I tried getting a group of friends together for a 4v4 Dominion, we'd be able to get into the match just fine. But once gameplay started, there would be a network issue that pauses the game for a few seconds, and it would happen every 10-15 seconds or so. I'm guessing it's due to whoever has a dodgy connection so they can catch up, but it penalizes the rest of the team too. It happened in every Dominion game I tried, but 2v2 and 1v1 games were totally fine.