Do you have a TMC box on?
I removed mine, sold it, had car remapped and no longer have problems...
Not saying the TMC box is totally at fault, but i think it was causing the car to just go over the edge...
Abarth spent ALOT of time on my car, replacing MANY,MANY parts and could not fault it in its standard form, I also cannot fault it now with its remapped ECU.
Ben.