My wife and I really want to play this game, but during the beta and now during this weekend event we see the same issue. It happens on two different computers, with different builds (and different GFX cards, hers is a sinlge Nvidia and mine is Radeon Crossfire) - it is unlikely to be related to hardware. It seems to happen quite randomly, sometimes we can play for an hour, sometimes less than 5 minutes. It immediately crashes to the login screen, no error message is displayed. I have run verify multiple times. This was the primary reason we never stayed with the game. I ran the GameConsultant and the only thing that seemed off was the ping test failing. Recently I have been getting simply disconnected on my PC, but will remain in game until I logout.
The computers have even changed since beta, so I suspect it is a network or router issue. One PC has 6GB memory, one has 8GB of memory, I assume this should be ok.
I just went through and added port triggering, so hopefully that helps.