2017 Alfa Romeo Giulia fuel system problems

I purchased this vehicle at the end of may 2017, after putting on about 500 mi within 4 weeks, a check engine light came on, I took it to the dealership, they kept it overnight,looked at it, and called the following day & said there was "something loose that needed to be tightened" and that the car was ready for pick up. I drove the car and parked it in my garage.

Driving along the highway the car completely shuts down and goes into limp mode. No power steering, no brakes, nothing. Absolutely hazardous and a safety issue. No way to start the car. No way to move the car unless owner goes under the car with a specific tool and unlocks the breaks manually. This is the second time it happened to be. I belong to a group of car enthusiasts which own the same model and several have reported to have the exact same issue.