My hunting partner uses a CTX. He has complained that for the past three hunts that he doesn't think his detector is working right. He said at one point Coil not detected appeared on his screen and he cut it off and back on and no problems.I hunt with a Nox 800 and he ask me to let him scan my targets. His detector wouldn't pick up my targets. Anyone else have these type problems? He was using his stock coil.