My H2 stalled at Death Valley!?!

[MisterH2]

My H2 stalled while I was driving up a paved road at about 50mph. There was no forewarning. I was in driving in D3 and all of a sudden I lost power. The check engine light did not come on. The battery light did come on however. I managed to pull over to the side of the road. Turned off the air and the radio. And was able to restart the H2 almost immediately. All the gauge readings were ok. The voltimeter was pumping about 14 amps. I started going up the hill again in D3 and a few minutes later, it stalled again without any forewarning. The altitude was about 3000 feet and the outside temperature was over 100 degrees. I was able to coast to the side of the road and restart the car after a minute. I managed to drive home in regular drive mode (not D3) and drive at slower speed. The next day I was not able to mimic the problem again. Maybe it's the fuel pump? It would have been scary if I was towing something and my H2 stalled going up a hill in the middle of the highway in traffic. Any ideas?

P.S. See my Death Valley pics under photos. I didn't know how to attach it to this thread.