I had a similar issue I could be driving along and car would just shut down and would only be Coasting along with no Head Lights, Loss of Power, Car would stop running, would have to try and pull over and pull up then restart the car,
And it didn't matter what speed I was doing either it happened from speeds of 50Kph thru to 120Kph....
It was Very disconcerning to say the least and had some WTF moments at high speeds and Night driving..
Turns out there was a short in the Brant alarm causing the problem

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It's your car, It's your story,
So don't let someone else write the book.... MCM