I have a Tesoro Vaquero I have had for about 5 years. It is a great machine but I seem to always have a hard time getting it ground balanced. I was at a new location yesterday right down the street from my house and when I tried to ground balance I would turn on the threshold about 1 o'clock and have it in all metal mode and the sensitivity on 10. As soon as I would lift the coil off the ground it would go silent until I was about 10 inches off the ground the threshold sound would come back but when I pushed it back to the ground it would go silent again. I tried adjusting the ground balance but it would still do the same thing. I live south of Atlanta, GA so there is a lot of red clay but I have never had this happen before. I also get a lot of false signals and the end of each of my left and right sweeps while I am hunting. Any help on this would be appreciated. I tired pulling the battery and checking to see if it needed to be changed but the battery was good.