I have an etrac, it has probably a couple of hundred hours on it, mine is doing the same thing, did a soft reset and got it back, called a couple of people at a minelab repair facility and they had never heard of it (funny that the machine has a visible error message and no one seems to know about it). I tried various different battery configs and nothing has stopped it. It still goes down and comes back up (for now) but I received a reply from another site that it is a mother board issue and around $800.00 to fix, so if it is still in warranty I would promptly get it back for warranty repair. This person also had one that finally went down and never came back up.