I can connect to LIVE fine, but as soon as I join a match, try to download a video or anything other than idling or browsing the marketplace, I am immediately disconnected from LIVE. I am able to reconnect almost instantly and it will stay connected until I actually use the service.
Also, I had no issues downloading the update. I just redownloaded it to see if that was the cause, but it updated just fine. So I know it isn't the Xbox's network adapter.
What is going on here? Is anyone else having a similar issue?