I'd try to isolate the problem area. If you can stabilize it, gently tap certian areas of the detector with your fingers and see if you get a response. That may pinpoint a bad connection. My Eagle would power off. I found a bad solder connection inside and fixed it. No more problems. I don't suggest you take it apart unless you are willing to learn at your own expense. Other things could be,,,,
Power lines, invisible dog fences, improper adjustments and of course batteries being weak.Bad connections also if yours has a power on off switch and not switched on with a soft touch pad. Things like that always react the way they do for a reason.