It started weeks ago, but now its getting to the point where it's happening everytime. When I invite people to my fireteam the game decides that it's better to boot me from my current, almost finished, nightfall to join up on the teammate that I invited. I've got no issues running it again, but this issue is getting out of hand. Add this on top of the major server issues that have popped up since the last update and you're got a game that is unplayable most of the time. I, like many, am really looking forward to TTK, but it's not gonna be fun for anybody if crap like this keeps happening.