all of a sudden, no sound from radio?

[dna]

I was driving last night doing some last minute xmas shopping when all of a suddeen the speakers died? The radio was on, all the buttons worked, I could change stations, but no sound. I even tried CD and even tried the On Star - still no sound at all. I parked her at the mall for an hour and when I returned all was fine again?

Me H2 is still under factory warranty - should I take her to the shop for this? What could cause all the speakers to suddenly die? Could the Bose amp be going?

Thanks