If I understand the problem, this is what happens to me. When I change coils, sometimes the headphones don't change which coil is being used. I have to minus or plus the coil number, 1 or 2, on the headphones. I think the reason, for me is, I'm not turning the headphones on at the correct time. I have to, in this order after changing the coil, turn on the Deus and then the headphones and then, thru the control box, select the coil I'm using and all seems to work correctly. Doesn't work if I change the coil, turn the Deus on, select the coil I want thru the control box and then turn on the headphones. Hope this helps.