I have a Minelab Advantage that went squirrelly on me. It turns on fine but will not make a sound on any metal waved under the coil. If I touch the coil connector where it it goes into the control box it starts beeping like crazy. I take my fingers off and it goes silent again. I assume it's coil problem but not sure. My brother in Ohio borrowed my spare Advantage with coils so I have no other coils right now to test. Thanks for any help!