TomTom for iPhone audio instructions get cut off by iPod music.

I'm running into a problem with the TomTom for iPhone app where if i'm listening to my music on my iPhone in the background while running the TomTom app, whenever the TomTom app mutes the music to say it's instructions, it is always cut off about a second before the end of the instructions by the music coming back in again.

For example, you'll be listening to your music, then it stops, the TomTom app starts talking, "At the next exit, take the roundabout sec..." and then the music kicks back in. It cuts off "...ond exit."

Obviously this is a big issue, as generally the last few words in the instructions are the ones telling you where to go.