My Car would Turn off while driving...

I had the same issue, car cuts off at 40 miles per hr or during acceleration to merge then the dashboard cluster and the radio cuts off and back on. Turn car on and off then it would reset. went through the sensor change out deal but. The issue finally came to the Alternator sending to many volts to the speed sensor or throttle body speed sensor in the transmission and freaking the system out. The alternator went out a year a so earlier and I replaced it with an autozone one ( cheaper,). Well I replaced that one with the $400+ one from Infiniti and the problem is solved. So if your alternator is going bad replace it with the expensive one.