Hi thanks for letting me join your forum. Iam in need of assistance, I have a gpx 6000 that when turned on it screams like continuous interference, I have changed the coil from nf to original 14 ml coil, and also restart in factory setting a few times and make no difference. I was wondering if anyone else has had this issue and had a quick fix., as I am out detecting for the next couple of days. Any help would be greatly appreciated thanks. I will put a short video up.