Just call Garrett.
I had a pro pointer purchased last may and it worked for few months then start flaking out some. It would only detect when it was almost touching the object, then if I opened it up put the battery back in it would work normal for a few minutes than do it again, I changed batteries a few times but I could tell it wasn't right. Then one day it just stuck making a noise. I Called and sent it in( I paid about $4 postage) They sent it back and it worked for a few weeks then same issue with not having a normal range, I called again and sent it in(Paid postage again). This time they sent back a brand new pointerand it has seemed to work fine the few times I used it, but the season still hasn't started here yet.
On my original one, I also found it would beep when I but pressure on the tip, I don't know if that is normal and not sure if my replacement one does that.
Customer service is good at Garrett, but both times there was about a 2 week turn around.
HH,
Pete