How Do You Stop A Garmin Nuvi 765 From Interfering With The Signal For A Garage Door Remote?

When I have the GPS device in my car, it will not allow me to close the garage door using my remote in the car. When the device is not in the car, the remote will work just fine. The problem seems to be with the closing of the door. The remote will work fine to open the door, for some reason it will just not close it.