Hi All! Got my replacement AT Pro Saturday ( first one the pro mode didn't work) but couldn't test until today because of work. Well, looks like it has to go back too. Completely erratic at times in all modes, pinpoint ramps up even with coil held over my head in the air. Couldn't detect a quarter on top of the ground when it was acting up. Called Garrett and they may send another coil. I got it home and played with it, turned it on and it worked perfectly. Moved through some settings and it started acting up again. I noticed how it falses when you shake the coil, so I tried that to see if it changed anything. Finally wiggled the strain relief where it enters the head and it went nuts again. By moving the cord there I can make the pinpoint not work, lock up any mode, and cause it to not pick up any coins. You guys might want to try this on yours, hope it isn't a widespread problem. Take care and HH! Earl.