I have an 06 GTO with 16k miles. Occansionaly (2-5 a week) while driving in the afternoon/early evening after the car has sat in the hot Las Vegas sun all day the Horn will honk only once and the duration is for less than a second. This usually occurs about 10-20 minutes after start up. I've taken it to the dealer three times now and everytime they return it NPF (No Problem Found). Has anyone else experienced this and what was the remedy?