I think you will find its a DPF, which is a filter that catches the particles generated by diesels (not pollen), these have eliminated the black clouds that used to come out of diesels. The dpf then burns the particles during a regeneration cycle. Different cars do this in different ways.
The problem in that when a car is used for short journeys and stop-start traffic the engine is not meeting its criteria to begin regeneration. Result - filter clogs and car goes into limp mode. What they have told you to do is correct to clear it.
This is a big issue with dpfs and one that consumers need to be educated on. Quite simply your driving style does not suit a car with a dpf.
We have an audi a3 that has had this happen a couple of times in 2 years. My mondeo which does it slightly differently has never had a problem.
The car is working correctly as intended, unfortunately its not really suitable for your purpose. If it keeps happening to you, it will keep happening for the life of the car.
Not a reason to reject the car im afraid as it is operating within its intended design parameters, but you do need to change it or your driving style. Sorry its not better news.
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