Hey Xbox members, are you having a tough time signing in to Live? Or difficulty updating your account preferences, managing your payment details, setting your privacy settings, or viewing and interacting with your Friends? We're aware of the issue and have our engineers working to get it fixed ASAP! Thanks for your patience while we get everything back to normal. We'll update you as soon as we have more info.
The support website for Xbox Live has also listed two services — Slacker Radio and Xbox Fitness — as being unavailable for the time being. In addition, customers playing Call of Duty: Advanced Warfare on the Xbox 360 may face frequent crashes during multiplayer, with Facebook sharing also affected.
We'll let you know once the services are resumed.
Source: Xbox Live Status