My son and I cannot form a fireteam on our local network. Last week everything worked fine. Now that ROI has dropped we cannot join each other. Other players are no problem. Other games are no problem. We had this problem after August update and we thought it had been fixed. Now its back! Just in time to prevent us from completing the new content together. We were planning to run the new raid this Friday. Doesn't look like it is going to happen. Very disappointed. Extremely frustrated. We have been playing together since Beta and now we are considering looking for something else. Please fix!