I tried getting my console on xbl for the first time since around February. It fail to update and gave me a code ending in C000-003C. I called support and they said my box was modded. I never modded it , let alone opened it. The only things I did that could've affected anything was playing a few games and getting some achievements or using an off-brand controller (a Pelican wired controler without any kind of turbo). I tried to connect via a used wireless adapter I bought at Gamestop today; if that's of any help.