I was out today for two hours with my lrp brand new battery. At one location i t ground balanced at 73 at the other it balanced at 66. At both locations i found very little. One place dates to 1891 the other a public park about 30 years old. My detector seemed to be "dead" , has any one had problems with their lrp as far as it just quits picking things up? All of the on screen functions seem fine.