Been using htc sensation for a week or so.

While playing an mp3 using either the stock htc sense audio player or doubletwist, a call comes through. I answer the call. The audio pauses. I hang up the call. The audio resumes but soulds mono and muffled like a very bad quality mp3 rip. This not just for the audio from the mediaplayers, it is all alerts/ notifications.

Anyone have any experience/ resolution with this issue?
Corrupt audio drivers? Faulty unit?