I have a White's 5900/Di Pro Metal detector which I've had for a long time and now. Its new and I only used it once. I am just starting to us it. I am a beginner at this so hear is my question and problem. I went to the beach and had all the setting on P per the instruction manual. After pressing the trigger with the loop waist level and releasing it (To set the ground balance), I lowered the search loop inches from the sand and started searching. After a few sweeps with the loop the needle pegged out to the right (No sound from the headphones). I had to reset the ground balance again to start over. It did it again time after time. The detector works fine in normal dirt area's like camp grounds ect. HELP ANYONE PLEASE!!