Ok so since ive had my ipod unplugging the headphones has stopped playbac. But today something wierd happened. Unpluging the headphones didnt stop playback, it just continued thorugh the external speakers. Also when i plugged the headphones back in the volume was REALLY low and manipulating the volume on the device did nothing. All I could do was turn the sound on and off if i scrolled all the way to off. But it wouldn't get any louded. I had to unplug and replug it in a few times to get it working asgain What could cause this?