Bizarre but honest question about turbo...

For a while now, about 10k miles, I've had intermittent barking of the turbo on deceleration and every once in a great while on acceleration. The other day, after a 2 hour jaunt, while listening to a weak AM radio station I heard the whine/spinning of the turbo on the radio. It only lasted as long as the station was weak, but it was definitely the turbo.
Is the turbo headed for failure?

04 6.0 Lariat AT with 3:73's