When my 6x10 coil is on my detector it will overload if I go above 10 with the gain. I had submeged the coil in water a few days prior, but I thought the coil should be water proof? This overload happens when the coil is in the air, at different locations and I have switched coils and the other coils will allow the gain above 10 with no problems. Is my 6x10 toast?