Car stalls then idles and shuts off when turning sharply?

As you have electric power steering, the only thing I can think of is some kind of electrical concern being present when turning so hard, causing an electrical system drag and stall. It's too hard to know, really, without finding out what elements are being lost when turning sharply - by monitoring component operation. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops