I also had the same trouble. I tried everything to help. Finally called Garret and sent it in. They replaced the coil. Brad said they did some electronic tuning, don't know what kind of tuning or know if I'd understand it anyway. I have only used the detector for half an hour since, AT is waterproof but I'm not. The pinpointing seems to be right on. Before I sent it in I would try to pinpoint and hear nothing. I could see the screen and knew there was an indication but no noise from the unit. The angle of the screen was not right for me to constantly look at it to pinpoint with. I relied on the tone to pinpoint. All seems good so far. I need to put more time in but feel things are correct now. As a side note, I changed the angle of the screen by loosening the screws under the unit and placing a small washer under the front part of the detector. This kept the front of the detector from resting on the rod just a little. The angle is better now and allows me to see the screen without lifting the detector to see the screen.