1powdercoater

Hello, 2002 Z06 38K miles. Two weeks ago my wife and I where out with with the car. We parked it and went shopping. The car sat about 2.5 hours, when we got back in we drove it about 4 blocks after which she rolled the passenger window down and we both heard a squeak...squeak. about every 3 seconds. I pulled over looked around, pulled on the wheels and didn't notice anything. After I got back in and started driving.. noise was gone and haven't noticed anything since. Car has only been driven 2 times since.
Any clues? Thanks