I was out with my daughter hitting up a spot loaded with new change. Every couple of minutes, the machine would just lose it's tracking. There would be just low tone beeps, even if I wasn't moving the machine. I lifted the coil up in the air, still would be doing it. I turned the machine off and then on again, and it would start detecting again, but a few minutes later, this would start again. A buddy of mine used the arrows that go sideways on my machine and turned up the sensitivity very high a few weeks ago? Maybe this could be it? I didn't even know you could do this, I thought you had to go to sensitivity. Should I turn this down? Also, I was going to use noise cancle to see if this would help? I was in the middle of the city of Buffalo, and the site is loaded with new coins, don't know if this would make a difference. Also could have been some ground interference? I've just never had this happen before. Is there a way I can see if the machine is running right? Maybe just load stock coin mode and see how she runs? Des in Buffalo