2018 Ford Mustang engine turns off when slowing down.

My 2018 Ford Mustang GT engine
occasionally turns off while slowing down. I
have taken it to the Ford dealership 3 times
for the same issue. 2 of the times they have
test driven the car for 5 days in a row with a
senior service technician allowed to drive it
home overnight to replicate the issue. They
never seem to come across the issue and
have done all their electronic and system
checks for any faults. On the same night I
picked up the car, the engine shut off while
crossing a 3 lane highway and nearly caused
an accident. Does anyone know what this
may be or has anyone experienced this
before? It’s come to the stage where it is
extremely frustrating and dangerous.

Ps - I purchased the car brand new and have
been driving it for a whole year without any
problems. After a year of owning the car this
problem showed up.