When I purchased the sensation 4g, I intended it to be an all purpose phone. I purchased an armband for the gym, so as to listen to music while working out. Initially, I used Pandora as a means of listening to music. That being said, I recently decided to transfer my music library to my phone. For some reason my music plays perfectly fine when listening with no headphones and no armband. However, I run into some problems when I go to the gym, place the phone in my armband, and connect the headphones. My music randomly starts fast forwarding, skipping through tracks (virtually every half second). Also, the phone randomly initiates voice dialing and proceeds to call people in my contacts. Is this a common issue with the sense? Is it having issues due to the armband? Is there a known issue with the headphone jack? Any info would be appreciated, thanks!