Battery issues
 

When my car is idling, sometimes it will stall. Sometimes ill just be at a stop light, other times ill have my car in park. It'll start to choke, and then shut off. The battery light will flash for a quick second.One morning my car wouldnt start at all it was completely dead, my first thought was the battery i had the battery levels checked out and was told it was a brand new super stellar battery. (sorry talking chick here ha) Normally my car starts back up right away, still its worrysome. Ive taken it to the dealer, and they have no idea because they cant get my car to repeat the problem. Any ideas?

2007 vw rabbit.