I'm trying to get the achievement for hosting 50 ranked matches on GoW. However, whenever I try to host a match with more than five people, it lags really badly. I have been troubleshooting for almost a day now and cannot figure out how to get a better connection, other than getting a new router that is Xbox LIVE compatible (Which will be a last resort).
Here are the things I've tried: Both wired and wireless connections, moving my Xbox 360 closer to the router, making the NAT open, and updating the router's firmware.
I'm new to the forums, so I wasn't sure where to put this, but I would really like some help, so I can host games and get my achievement.
Thanks in advance if you can help.