Not many people have this problem so far only me and my friend, what I noticed is that during specific times I can play fine, we both can. I tried Static IP, Dynamic IP, DMZ, Google DNS, Default DNS. Yet to try Port Forwarding, but I doubt it will work since DMZ didn't and my line is 3mb download and 0.5 upload. The only other person that use my wifi extensively is my brother playing TF2. The problems started after the update. BTW, Finding a match on Ghosts is rare.