need a little help bought a used AT Gold detector not beat up has a few light scratches. Have used the AT Pro years and really liked it never had the gold so bought one used . it seems to have a lot of static background noise when swinging over the ground hits solid on targets and gives good ID numbers just really noisy . Had threshold set at 00 and even tried adjusting in the - as well as + no change . tried different coil still noisy. Did Factory reset still the same . are they just staticky . I was thinking on sending it in to be checked out but before I did wanted to ask those that use them their opinion . and it ground balances very well and is quiet when I hold it in the air . Thanks for any help or opinions