NHTSA Complaint #11537911 — 2014 JEEP GRAND CHEROKEE

I own a 2014 Jeep Grand Cherokee 5,7 summit trim, I've been experienced a very scary situation with this car on last 4 months, with no warnings this vehicle completely shuts-off, with no power, no radio, no dash lights. For few times happened on my drive way, but most the times I was on highway running between 45 to 70 mph, its come from the blue. But after the engine stops, it just restart like nothing had happened, no lights on dash no warnings. I left this truck on sandy Sansing dealer ( Milton Florida (850)6236866 like 4 times, they replace few sensors and update software on first time, but day after I was there again, and again and again. Now, they have my car o shop for over 40 days but they can find or replicate de issue, of course to replicate the issue you need to drive the car, and according with then they drove the car for 50 miles with no issues( and of course nobody wants to drive a car that can stops in any minute ). I ask the Dealer if a fuel pump could cause that, they had no clue, but they gave me a price for replace both, so at this point I'm extremely frustrate, cause I've a car with a brand new engine that always was serviced on Jeep Dealer, that I can't use and who has all technical capability is incompetent to fix. I saw lots of cases like mine on internet. I could get someone or my self kill. Any help is deeply appreciate