Hi all, I'm a fairly new ctx owner with about 20 hours on the machine. My question is regarding the curser in ferrous coin mode. About 75% of the time it's stuck in the 12-38 or 12-40 position as I sweep the coil. Different targets in the ground will send it to other positions on the screen, but it always wants to go back to the 12-40 area which seems to he its home base . Is this normal?