Update: The Xbox Live service is now up and running normally.
Original story: Microsoft is currently working to fix problems with Xbox Live connectivity.
The company has issued an Xbox Live service alert, acknowledging that there are limited gaming and social features available on the online platform.
A statement reads: "If you were having trouble matchmaking on either Grand Theft Auto V, or Call of Duty: Black Ops II due to the maintenance taking place, worry not, Xbox members! The work is complete, and matchmaking features are now functioning normally. Thanks for being patient during this time."
Xbox Live core services and the website are up and running as usual, as are purchase and content usage, plus TV, music and video services.
A similar Xbox Live service alert was issued last Tuesday, when purchasing features were also affected.