Thank you for your post. If you would like for me to research your VIN to see if there are any open recalls or special coverages that maybe related to what you're experiencing, I would be glad to do so. Please PM me your last 8-digits of your VIN, name, contact phone, and current mileage. Since your vehicle is still under warranty, I would also recommend taking it back to your Chevy dealership to be diagnosed as they would be most familiar with your vehicle.
I look forward to your reply.
Vanessa
GM Customer Service