This is a booting problem. Please see this video that we have made that will explain why it happens and how to get the problem resolved. Garmin GPS Booting Problems By SHARCNET USA
This is very easy to resolve. Connect the unit to your PC with a USB cable and go to the Garmin website and download Garmin Express or Garmin Web Updater. These programs will scan your unit and offer you additional files to download. If you still have trouble, email me at sharcnet-usa AT sharc DOT net and I can send you the files.
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