Hi Al. I have a Nuvi 3590 LMT. It would keep showing that Power has been Lost, and shuts down. I cleaned all of the connections as best I can. That didn't work. I replaced the powered Mount. That didn't work. I replaced the GTM60 power/traffic cable. That didn't work. So I believe it's either the connector on the 3590 itself, it some sort of internal problem with the unit. I did try a complete reset as well to no avail. Any other ideas or suggestions? Or do I need to replace the unit? Thanks.