I took my brand new Dual field out for a spin today and I got a hit right away (first coin), I got a second hit (2nd coin) I am pumped now, I got a third hit (a nail clipper) on the forth hit (within 10 minutes) which was in the water, I dug my first scoop, I then went to pinpoint and the threshold changed to a solid steady beep. The detector now does not detect any metal. What a bummer :angry: . Has anyone ever experienced this?