where is the transmission sensor

What is your question?

I am driving down the road and all of a sudden the transmission feel like it in neutral but it is in drive. I push on gas peddle and it does nothing. I then have to turn off the engine for a minute then start the car again. I continue once again but a couple minutes later it does the same thing again.It took me 6 tries of doing this and I only went 2 miles down the road .