Large groups constantly crashing

Zeviroth

So far the game has run incredibly stable for me without encountering any real bugs. Untill we start to form groups larger then let's say 10-12 men. At that point the game becomes a disaster unfortunately. Then it strings together one crash after the other. Voicecoms become a mayhem of people all constantly crashing at the same time. So we can be sure it's not anyones local system but a server side issue.

Anderax

This has been happening to my guild as well when we group up to do RvR.

Ciovala

Also have this problem in Cyrodiil.