Garmin Nuvi 2599 Turns Off Unexpectedly

Check along the entire length of the cable for any cuts, frays, or kinks, which could affect the connection of the internal wires. Observe both ends of the cable connections to make sure the plastic is not cracked or broken. Look closely at the small, metal pins inside the mini-USB end. They should all be straight, clean, and not pushed back into the connector. If they are damaged, you will need to replace the cable.

After years of use, the internal rechargeable battery will degrade and lose its ability to hold a charge. This can cause the unit to shut down or constantly reboot, especially when running on battery power.

Leaving the device mounted on a windshield in direct sunlight can cause it to overheat and temporarily shut down as a safety measure. If the unit feels hot to the touch, move it to a cooler location.