I was detecting over the weekend with my Garrett ATX near Redding. The ground was moist and was mostly a reddish-orange clay like soil from the decomposed shale bedrock I am assuming. When I moved away from the creek bottom (gravels and bedrock) and went up on the hillside or in tributary gulches I would encounter soil areas that made the detector constantly give a target signal or what I would say is a mineralized ground wine or squeal. I tried ground balancing several times, but it did not alleviate the problem. Ended up shutting down the machine and relocating, basically starting over in a new area where I could maintain a normal threshold sound. I have used the machine for about a year and this has happened a couple times, but it happens infrequently. The first time it happened I had a low battery and figured it may have been a symptom of a low battery. Any ideas, similar experiences, and/or tips using the ATX would be appreciated. Thanks in advance.