Recently, when using the iPod function on my iPhone, after about 10 minutes I begin to get voice activation prompts. I hit "cancel", but they come back after about 15-30 seconds and are constant. The only way to stop them is to turn off my iPhone completely. Also, once the voice activation prompts begin, I have trouble with my music as well- it will speed up and go very fast, as if I am fast-forwarding; it will jump around from song to song at random; and I'll suddenly be unable to use the controls so I'm unable to pause. Again, the only way to stop it is to turn off the phone completely. I'm at a loss as to what is causing this.

Help! Thank you.