I also sent my bad D2 in yesterday,the one I am hunting with had the null shift again.As it is, I cant get the detector to run with an RX over 4 without severe falsing.This is at sites where running an RX of 10 was no problem with a good D2.I know what a good D2 is capable of,trying to convince me that a coil is still good when it cant run at an RX above 4 isnt going to happen.Yes,the coils can still be hunted with but as far as coin type targets,you may as well forget about the 6+ depth range.