For the past week or so, my multiplayer connection has been unstable. My modem/live connections are working just fine. One time I will login to COD multiplayer and it will let me in.... works fine. Then the next day it won't work. It tells me the COD
servers are unavailable. Keeps going back and forth...... frustrating.
Hey, i've posted this solution elsewhere, but I had the same issue and found a fix on the Treyarch Black Ops forum. Check the time on your 360, you'll likely find it's fast. Log out, correct the time in Settings and log back in. I went straight back in and
haven't had a problem since. hope it works for you too.