We reported yesterday on a patch released for Guitar Hero II that was supposed to alleviate the issues with the Guitar Hero II X-plorer controller. It looks as if the patch may have made things much, much worse.
You'll definitely want to hold off on updating Guitar Hero II. Initially reported on Destructoid, a significant number of users who downloaded the patch subsequently have gotten the "red circle of death" on their Xbox 360 consoles shortly thereafter, with constant freezing another common issue. The verdict thusfar: large repair bills from Microsoft to RMA their Xbox 360 consoles.
The issue is brought to light by a thread on the Official Xbox Forums, with numerous users complaining about the same issue. Representatives for Activison and RedOctane were unavailable for comment.