I just got it in today. I was testing it out (for about 10 min)and the control display changed to what looked like a little "L". I thought it was in a different mode. Then it went complety blank. So I unpluged it and pluged it back in, then all the lights lit up and did not go off. I realized it was hot to the touch. Do these have overheat problems and what might be wrong with it?