I bought a new 5s over the weekend and have noticed an audio issue when playing podcasts over Instacast and Podcast apps or music through the Music app. I first noticed when using it in my car, plugged into the auxiliary jack. Periodically, I would hear a loud hissing/static noise which would last a few seconds each time and be louder than the podcast/music playing. I made sure the wire was fully in both jacks (it was), then assumed it was just an old cable which needed replacing. But, I then tried the 5s on an iHome desktop speaker and had the same issues. Worth noting I don't have any case on the phone, so it isn't a connectivity issue for that reason. I upgraded from a 4S and plugged that phone back into both of the systems where everything played without issue, so it is something specific to the 5s? Does anyone know if the headphone jack is in any way different in the 5s versus the 4S? I wouldn't think so, but perhaps I missed something and need new equipment. Is anyone else experiencing this issue? Anyone want to take a guess at what is going on? I was wondering if there was a hardware issue with the headphone jack. FWIW, it isn't a speaker issue as the audio is fine when the phone is not inputted into another device. Thanks for your help.