This has happened to me on my Nissan a few years agoin similar circumstances to you. On my way to work, stopped outside the bank for some cash, car wouldn't start. Phoned breakdown service and whilst waiting, about five or ten minutes later, tried starting again and away it went. Reported it to dealer next time it was in for a service and they found details of the failure to start but not the reason. They just told me I would have to wait until it developed. Fortunately, it hasn't happened again.
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