When my crankshaft sensor failed, symtom was car would stall while driving. It would only start again after the car had been left for
20 minutes or so.
This happened twice over a week before I changed it.
please get hold of your local bosch diesel specialist and tell them about your fault. fiat and bosch are aware of it and working on it my car is at direct diesel bretton chester 01244 660787 ask for dave he will tell you all about it my car is refered to as the blue thing and has been there as long as some of his staff.
i honestly believe your car has the same fault as mine so before you throw more money at it make a phone call