I have a Lowrance 2000c GPS that has a problem. I was setting a user waypoint and wanted to get as accurate as possible. In order to do this I zoomed in to the max zoom, then set my waypoint. When I zoomed back out to continue my flight plan the GPS turned off, then on but only to the opening page which contains the disclaimer about not using the GPS as a primary navigation aid. It did not fully cycle to where it could be used, then it turned off again, then on, and so on, never getting past the introductory page. I can see a message in the upper left hand corner which says "over zoomed". It also shows a graphic of the SD card in the lower right hand corner. The only way to stop it from continuously turning on and off is to pull the power supply chord loose from back and then let the internal batteries die.

Has anyone experienced this? Any advise before I make a boat anchor out of it?