I was detecting all morning and after 5 hours or so, and heading back to the truck, my Nox800 suddenly just turned off. I tried to turn it back on and it just showed the rotating two bars, beeped, and repeated. I then tried turning it off, back on, and do a factory reset. It wouldn't do that either. I tried several times to either turn it on and/or factory reset without success. Brought it home, tried again, and it fired right up! Anyone else have that happen?