Can anyone confirm this?
1. Play with headphones
2. Pause the game
3. Switch the iPhone "off"
4. Get a call
5. Ignore the call
6. Slide the iPhone on again
7. Start playing.
Now the sound is gone until you completely restart the game.
You should follow me on twitter here!
I have this happen in similar situations in geoDefense and The Creeps. It happens to me when I get a text and ignore it, or if a timer goes off while I'm playing. Happens to me w/o headphones.