Hi Bill, mine does it while sweeping ground for targets. In other words the tones ( I use the 8 tones) will sound the same on all targets but at a higher pitch. A nickel will sound like a quarter but the pitch will be a lot higher than normal. I than turn off the detector and will work normal for a bit , than it will start doing it again. When this happens , even the pinpoint pitch is affected. I have to power off the detector and than power it back on and it will work normal for a little bit. I thought it might be the coil but I've used the 5.3, 6x10 and stock and it does it with all. I don't believe that is normal. Your video shows the tones changing while pinpointing , does yours do it while sweeping coil for targets?