I have explained my trobleshoot poorly. I immediately changed all batteries for new/fully charged. It ,WM12 was turned on after the detector and paired before attempting normal quick start. Sound present until I went to wave over ferrous ring, dead and wouldn't shut down, removed the battery and reinserted it.Retried without using WM12. Used brand new headphones for exactly the same result at the ferrous ring stage of quick start. Also wouldn't turn off. I then reset the equipment as per manual and tried again for the same results. Nothing has ever been wet, dropped or left outside. Very thankful for the time and effort taken for the responses. I will be sending it bact to the manufacturer as soon as i get back home. Its more than a little bit disappointing to see that this problem is not just a one-off, but the fact that it wasnt mentioned as a possibility on the day of purchase. Not very impressed with that at all.