We could use some help. we got out to detect for awhile today, thats the good news. We started off pretty well, took the spectrum out. You know we found a couple penny's, then it was like all of a sudden the only thing we seemed to be picking up were flatten cans. We tried changing settings with no luck, then we dug a hole probably 3 inches deep, and put a penny in it. The machine would not pick it up. We tried several other settings as well. The battery reads good, it was really confusing today. The machine never let us down before. Any ideas?