I have a 1.6 8 valve auto hatchback. The engine occasionally stalls, usually when approaching a roundabout slowly but it has happened once before when just ticking over in congested traffic while in Drive. There is no spluttering or warning light, the engine just dies. On a previous occasion, RAC checked it on computer and found no fault. Last time it happened might have provided a clue. It would not restart in Park but to my surprise did so in Neutral. Any advice would be valued.