I had my Compadre w/discrimination right below iron nail because the old schoolground was loaded with tiny iron. I was getting broken signals from some of the iron but nickels-even a buffalo-were popping out everywhere-probably from others running higher discrimination. It was BLAZING hot but I was in the shaded area of the schoolyard. Still, I was feeling really HOT. Then, it happened. I started hearing TWO tones in the headphones. The Compadre was only about 6 months old and I was dreading sending it back in. STILL, the signals were clear-only they sounded like a car horn blowing. I took out the headphones and the sound was the same from the speaker. I was near the edge of the shade from the trees, so I finished until I started feeling the rays of the sun. I took off the headphones and headed for the van. I cleared my throat and then it hit me- it was me! I had gotten too hot. Whenever I talked or cleared my throat it resonated in my head like a hollow box. I HAD GOTTEN TOO HOT-EVEN IN THE SHADE. Take care, guys.