Nuvi 265WT is re-mounting itself after "safely removing" from Windows and Mac

 

My new Nuvi 265WT is re-mounting itself after I "safely remove" the Garmin on my Dell. It does the same thing after ejecting the Garmin from my Mac. My Nuvi 250W would stay off once removed/ejected. How come my new Nuvi 265WT remounts itself into Mass Storage Mode (screen with PC Tower on it)? It is a big pain to unplug the GPS USB cable during the 3 seconds it stays off in between mounts. Anyone have any ideas or similar problems?

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nuvi 250W nuvi 765T