Hi, I just recently bought a used CTX 3030 and have the following issue: Sometimes ( not all the time ) I get a good audio signal without the corresponding FE-CO numbers showing up until I stop swinging the coil. Am I in some kind of program with unusual settings that would cause this, or is something wrong with the detector? Like I said, I get a good audio response and have read the manual numerous times trying to figure this out. Thanks to all who reply.......