My car shuts off without any warning while on the High way what causes this?

What is your question?

When the car is on and driven for hours at a time it shuts off no warning nothing just stalls out and I'm stuck in the middle of the highway can't run air conditioner nothing.

What makes this problem better or worse?

When the car runs

How long has your 2008 Nissan Altima had this problem?

For about a couple of weeks now