Hi,
I am a little unsettled as I my car again stalled on the morotrway at rush hour.
This is the first time I reported it:
The exact same symptoms happened again.
Here's what happened:
I am driving 80mph+ for 40 miles
Then I hit some motorway traffic where my car stops and starts, stops and starts while flowing with the traffic. I am driving in the slow lane on the left.
Then traffic comes to usual stand-still and my car will not accelerate.
I press the accelerator but no kick, it just revs.
Some thankful driver behind me gave it a push so I could park it in the hard shoulder.
I shut down the car for 30mins knowing it's not worth driving in heavy traffic as the issue seems to happen when I am braking and accelerating a lot.
Once the traffic quietens I drive home at a steady pace for 20 miles without an issue.
What is going on with my car? 
It's lovely and reliable except for this one repeating issue that's now happened twice.
Just last week I took the car in for a full service.
When I took it to the mechanics two months ago for the same issue they could not find an issue with it.
Please help.