When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
If you have HID lights, these bulbs tend to do that when they start to go out. Usually you can flick it off and back on and they will fire back up, only to go off again after a little while. You can swap the bulb to the other side and see if the issue follows the bulb to confirm it's not the ballast.