
No wonder you take two! Over time, the cables develop internal intermittent breaks where they enter the connectors. I have ordered these several times for use with my Garmin Nuvi which I use for about 10 hours 5 nights a week. I have used 4 of these cables in about 7 months. They're cheap and not worth returning, but it's important to realize that for mobile (on-the-go!) use, they're essentially "consumables".