Could it be immobiliser issues?
I had a few problems with starting my car when I first got it, which I eventually put down to the car having been stood at the dealer's for a while, and put in a new battery which seemed to solve everything. Only once did the car cut out (during a test drive). The more common problem for me was getting the car to start sometimes; it would turn over but not start, which I think was down to the immobiliser. Not sure if the immobiliser and battery problems were linked but I havent had any issues since replacing the battery.
Probably not related but thought I would share...
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