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Issue seems to have cured itself. I suspect that the solution was connected to an update of the android operating system on the Samsung 4S smartr phone, as nothing has changed on the car's connection, bluetooth, computers, etc., so far as I know. In any event, the phone now works perfectly in the car connected through the bluetooth system. I do keep the phone connected to its charger while in the car, as bluetooth connectivity setting on the phone tends to drain the phone battery rather quickly.