I also have the Instant-On radio problem, and complained to my dealership.
The reply I got was:
"At this time this is a known issue. It is a software problem and smart is aware of it. At this time there is no fix for the issue. Tech support will be sending out a update as soon as the solution is found."
This seems at odds with the other posts here, which state it is a hardware, not software issue.
Anyone know where I can get a truly "official" answer to confirm/contradict what my dealership is telling me?
-Aaron