Intermittent Electrical

I seem to have an intermittent problem with my M3, any information you may be able to provide would be greatly appreciated.

My ride keeps dying guys, I'll be cruisin down the freeway and it drops to zero RPMs. When I pull over and try to get it to fire, it plays dead for a good 10-15 minutes It turns over but will not start. I ran the OEM pedal Diagnostic on it, all I got was a internal memory code. Ran a Pro Scan on it, got knock sensor codes. What would cause such an issue? The engine light does not remain on, after the car is running again the check engine goes away. Timing? Faulty Sensor? What's up?

Most likely crank sensor failing. Soon the car will not start.
That would be my best bet.