Xbox Live seems to have been fairly stable for a few weeks since a spate of issues that were frustrating users a little over a month ago. Today, however, the Xbox Live platform has been bitten by the instability bug. This time, Xbox Live is having issues with buying downloadable content.
As always, head on over to the Xbox Live support status page, where you can log in to Xbox Live and enter your phone number to receive notification when the service is back up and running well. In the meantime, let us know if you run into any other issues with Xbox Live.