I just bought a used V3I off ebay and it seams to works great, However when trying to search with the high trash program all I'm getting over all targets is a small blip sound, I put a few coins on the ground and it barely picked them up. What could be wrong with this program? I should be hearing a good solid tone for these targets. I am currently using the 10 inch 2d coil. Any help would be appreciated.