I have an Excalibur 1000 that I brought to the beach for vacation and last I tried it, it worked. I went out to detect this morning and as soon as I turned it on the threshold sound was very loud and it stayed that way no matter where i set the knob. Turning the volume knob didn't change anything and switching from discriminate to pinpoint didn't change anything, all I'm getting is that constant sound. The coil was not responding to any targets I put under it either. I'm really freaking out right now and hope maybe someone knows what it could be