Filed Under: Mac Tagged With: audio, Flash, movie, MP3, QuickTime, Safari 5.0.1iPhone 4 Headphone Volume Jumps (Increases or Decreases) While Listening to iPod, Pandora July 22, 2010 by Serhat Kurt 23 Comments Some users have reported an issue in which iPhone headphone volume erratically jumps up or down while the iPod app, Pandora or other apps are in use.