The first time I found the stereo FM turned on, I thought I'd forgotten to turn it off even though I was sure I had. The second time it happened I was picking up the trailer from where it is in storage. A loud static noise was coming out of the speakers. It was turned on (quite loud) and not tuned to a station. I know it had been turned off when I dropped it off. Still not sure if I was loosing my marbles. Now convinced! Went to the trailer today at the storage facility. The stereo was on. Again not tuned to a station - just static. This problem could run my batteries down if left for a period of time. The stero system is Jensen and works just fine otherwise. Suggestions??