Silver reflecting cylinder or diamond shape object floating

Driving on salt point turnpike heading south/west I noticed a bright reflecting object. It seemed to be diamond or cylinder shape. It seemed to have some exhaust or other oscillating air/field around it. I estimate it was about 10-15,000 feet up, because it was much lower in the sky than a jet passing overhead. I could not tell the distance or size. It would float still when I was looking at it. Sometimes I would look back and it would appear to have moved. Disappeared after 3-5 minutes. The flight tracker I checked did not have anything close by - only much further south.