recently I have noticed that the 2 center A/C vents don't come on with the 2 outer ones. This is intermittent. but happens daily. If I stop the car and restart it it works fine. Dealership has no idea why this is happening. Went to the dealer Hub in Houston and the service manager did fiddle with the A/C controls on the screen and it hasn't happened in 6 days now!! Any thoughts? 61K miles '15 Genesis 3.8

