Recently, I and many other have downloaded the latest update only to find our 360 unplayable after aprox 5 minuets. At the moment it looks like Microsoft is trying to cover up this issue, but being one of the affected I will not be silenced!
See this link here: http://forums.xbox.com/1/25603474/ShowPost.aspx#25603474
See this link here: http://forums.xbox.com/1/25603474/ShowPost.aspx#25603474