I have had coil issues from day one ....I contacted Garrett about it , and they claim that the coil will false when twisted in the air is "normal " and that DD coils are more prone to this situation, and there are other coils that do the same thing ......... This being said , the coil will also false when stopped abruptly to change direction .....It will also false when bumped into any sapplings or such when woods hunting ...... IN their defense , they offered to let me send the machine back to them , but since everyone elses machine is acting pretty much like mine is , I opted NOT to have the machine sent back .... Since they are saying that this coil falsing like it does is "NORMAL ", I saw no sense in sending it back ...... Every machine I have owned ( and there have been a few of them ) that have DD coils have NEVER exibitted this kind of problem .....Many of them are cheaper machines, and many are more expensive mechines , but NONE of them have exhibitted this problem ..... When there is ANY problem with noise in a coil whether it be EFI conditions or a short , or any other problem , the noise will get louder as the Sensitivity is turned up ...... If you hit a target , the target will come in loud and clear ....If you have a short or any other problem , as the sensitivity is turned up , it will also become LOUDER !!.... You will not hear the coil false when twisting the coil , or bumping sapplings , or bumping the coil on the ground , or stopping it short to change direction , if you turn the Sensitivity down ...... Turn the sensitivity up , and you hear the problem loud and clear ...... All this is saying is that the problem is there, and it will get louder as the Sensitivity is turned up ....... There are a couple of theories that are going around by reputable people in the industry who have seen and heard of this problme before ...... I don't think that anything will ever be done about this as Garrett considers this as "Normal " behaviour ......The coil still finds good targets , so people accept this behaviour as NORMAL, so everyone will continue to live with this situation ... ..... I'm not going to hold my breath waiting for any fixes , and will wait for other proven theories to show themselves over time ....... For now , I will hunt with my AT Pro and deal with the falsing, and will continue to find good targets .....Other issues with the arm cuff being too short , and the lower rod wobble , will be addressed when I build a straignt shaft setup for the AT PRo ..... Im already use to the coil and headphone connectors , so that's not an isse anymore ....Some don't like the headphones , but I have not had any problems with them ......Take away that falsing issue , and I'm a happy camper ....This machine is growing on me !!..... Jim