I took my daughter with me for a vacation in Mackinaw City, Michigan. I have always wanted to do some detecting on their beaches, The first day we went to the town of Cheboygan and I hit some beaches there and didn't find much. The next day we hit the beach of our hotel in Mackinaw and my Compadre goes haywire, it starts giving me popping and cracking sounds. I pick it up and hold it above my head and it's the same thing. So I go back to the hotel room and try it out and it's still wacky, so I grab my daughters Campadre and it does the same thing. So later we go downtown to do some shopping and I pull it out of the back of the car and turn it on and it's still haywire. Later we leave and head to my uncles who lives about the mid part of Michigan, I pull the Compadres out and check them and no problem. What on earth could have jammed them up so bad??