My CX lll has developed a warbly tone in the non motion mode, I have tried re-booting, reducing sensitivity, re-ground balancing with no effect. The batteries are good showing 3 bars. I also noticed that I could not adjust the threshold in the non motion mode it appears to be locked up. In the motion modes the detector works perfectly. Anyway I boxed it up and shipped it back to Garrett for repairs, hopefully it wont take too long. Has any other CX lll users had this problem? Best of luck to all.
Jerry Murphy
Jerry Murphy