I was out for a beach hunt this morning for about two hours! Hunted mainly the wet sand! On the return trip back down the beach, i switched to the upper dry sand! Nothing i haven't done before! After about ten minutes, i got an Err 41 and the unit shut off! Tried to turn on several times, and the error code would repeat and shut off! Did full reset a few times, but same thing!  I still had two bars on the battery, so i didn't think it was a power problem! I thought maybe an overhe