multiplayer

Hi, I just came back after an long pause. If I join a game and we start a quest my game crashes quite fast after a few attacks (probably when my team mates attack) If I open a game and play on my own (without a quest) I can play just fine. Pretty much nothing has changed since I last played...

Every time I finish a quest with friends it kicks us all to the lobby where we need to remake the group. Is this normal? Or is there a way to get this to not happen? I couldn't find anything in the FAQ, and its starting to bug me and my group of friends. Any help would be greatly appreciated!