Mine was acting up last week , called Garrett they told me it was out of warranty when I gave them the serial #. I don't think there's a way to check online . They told me it would be $50 to replace the coil in the pointer. I'm NOT speaking bad about garrett , but I'm thrifty.
Mine was falsing at everything even in mid air. I watched some YouTube videos and decided to try and fix it myself. I covered the wires that connect the coil to the board and separated them with some plastic. No more falsing. Seems to b working.
If I do invest in another pointer I'm gona try the Deteknix xpointer.
Good luck and HH