I have had the same account for quite a while on XBL. My first on and its still being used, but lately if I try to play COD 4 then MW2 the infinity ward splash screen doesn't come up and my xbox just freezes at a black screen. If I try to play Perfect Dark, saving always says failed and that achievements To fix this I usually just recover my account, but when I do this now it says Xbox Live Sign in is Unavailable.
I can sign in perfectly with my backup silver account, the same with play the games. So it isn't the files/disks. What could it be?