This issue has been occurring alot on Xbox 360 when doing a 4vs4 party group (listed below). We did not receive hardly any locks on a party group of 3 with 1 random person.
3 out of the 4 People Players Downloaded the Elite Faction DLC
Details:
In a 4vs4 Playgroup, if we wait in a room longer than 40 seconds for people to join up. Our playgroup will hard crash along with other connectivity issues at the Waiting Screen and when attempting to load into game. These problems were experience more frequently in an Xbox Live Party of 4 people. However when in an Xbox Live Party of 3 people and having 1 random player provided by the title, these issues occurred less frequently.
Counter:
For us to counter this; we have to count 10 seconds and exit from one location to another until we find 4 people on the opposing side. Doing this we'll have a 60% of getting into the game with out losing one of our memebers.
If you need any help with more detailed re-pro's please let me know Ubi Dev.