So the headphone jack on my iphone 4 is acting weird. When I plug my computer 3.5mm plug into the headphone jack to play music through my computer speakers.. it's fine.. at any volume. when I plug in my headphones, you can only hear it at 75% of the volume set. If you try to lower the volume, either through the side buttons of from the ipod itself, you can then only hear static.. until you increase the volume to about 75% or so...I thought it was the headphones at first, but I bought a new one and it's the same problem. Weird thing that it works fine with the computer speakers. anyone encounter this problem?