I just recently got a 250 and I'm wondering if it's working right, I have found a few things (about $2.50 worth) but I took it to a park today and it started acting weird. Noise coming through the headphones (static), acting erractically so I turned down the sensitivity and that didn't work so I put it in coin mode and it worked a little better. This was in a field not around any playground equipment. Then when I found something it may say like 4-6 inches and then I put the pinointer on and it's like 2" (which is right?) Wondering if I should send it back