I have a Time Ranger that sounds off almost all the time I am swinging it. I brush a few wild onions it sounds, I brush a seed head on a clump of grass and it sounds. I was working under a sweet gum tree two days ago and the little stems, like stems on a cherry, on the sweet gum balls made it sing. Lots of gum balls and lots of singing, it was very frustrating. I find it will sing when I reverse direction at the end of a stroke.
I find it very annoying cause I am constantly going back over areas that have nothing buried in it cause I am afraid I am going to pass over a good target. Thinking about sending it in for some kind of look see by the manufacturer.