This has happened several times before but I thought the connectivity update may help with it so I didn't post about it.  However, running the latest beta build it just happened again.

For whatever reason, sometimes during a game (at a seemingly random point) the game will split into several games with the AI taking over for others.  This most recent game was mid-game (level 8ish) 3v3.  Out of nowhere (a little lag, but nothing terrible to that point) all of a sudden all but one player got kicked from the game I was in.  A friend of mine in the same game said he experienced the same thing (him and one other left in his game) with a different player left.  The last two players ended up in a game alone (so from the one game there ended up being 4 games with AI filling most 4-5 slots in each.