My sons x-cal is on the lam,,,,erratic signals if you hold the detector still with no motion, Also no change if you wiggle the coil or headphone wires. I have 2, 800s and 1, 1000 ...This unit with the yellow headphones has a crack around the outside of the coil and the other x-cals with the blue headphones have a coil unlike the yellow one. Minelab told me to try to dry out the coil but after 5 days in 90 degree heat its still the same. Wow cant believe it was 26.85 for shipping to Minelab,, I'm sure it needs a new coil, I guess its time to go back to coil covers or do the epoxy treatment.... The coils here look like they were poured in one piece, the one I sent back, sorry forgot to photo it looked like it had an outer covering and it was splitting apart at the seam. make sure you check the bottom of your coils, I think this one is gonna cost me.