I've been plugging my V20 into my treadmill so the music will play over the treadmill speakers. Every time I do this, the screen gets dark and with a very yellow tint? When I unplug it from the treadmill I usually have to restart the phone a couple of times in order to get it to go back to normal color. Anyone know what this is?? Its not battery saver and I don't see anything in settings?