I just purchased this on Amazon last week and it arrived yesterday. I'm not sure if this is normal play feature on this. My dock at first start up the disc will light up. It stays lit for about 20 mins. Then the lights on the disc turn off. So I turn the feature back on this time around the light is on for only for 4 mins. I know it has three setings Off, Low, High. I always keep the setting on the High. The high means it's at the brightest setting. I don't see what the point is having this light up if it won't stay on untill I turn the feature off or turn the unit off. Is this normal for this Monster TRON audio dock?