my gt keeps falsing in wet sand bad. In the dry sand ok but in the wet constantly. I pull the jack for the headphones out and listen with the speaker and no problem. I plug back in with my grey ghosts deep woods brand and back again. I borrowed a pair of sony headphones that do not have a limited built in and not much of a change. Ready to return the detector to customer service. Could the jack be bad? . I know how to setup the gt and all that. Guys I meet say their gt is quiet for the most part. Not this one. Not running a coil cover for now and using the stock 10". any suggestions?