Stalls at normal operating temp.

I've searched the forums and didn't see the issue I'm having so I decided to post...About two weeks ago while in the fast food drive thru, my truck stalls (2008 Nissan Titan). No sputtering, nothing... Just dies. Later that evening it started and got about home and stalled again. About 2 miles. The next day we noticed that it will start fine with the engine cold. Once the engine reaches normal operating temperature, it dies. It starts back up fine and then dies, almost immediately. If you wait a couple of hours for it to cool, it will start again and run until it warms up again, and the vicious cycle repeats. Can someone help me figure this out? It's driving me insane. Any ideas are appreciated.