Landrover Discover Sport exhaust filter full

Good morning, last year we bought a new Discover Sport 2.0 liter 4-cylinder ingenium turbodiesel with 150 hp (automatic gearbox) (4WD) and are mostly very satisfied with the vehicle. The car now has a little over 18k KM down and reported to me today that the exhaust filter is full and I have to contact my dealer. The red warning triangle lights up and the engine light is on, the car can now only drive with reduced power. The car will be a lot Short distance driving, that is certainly not the optimal condition for the particle filter. But I am surprised that the filter is so full already in the second year at under 20k KM, that only the workshop can help. Before that came no warning message, that you should burn the filter freely or something like that. Does this happen about the guarantee? Does anyone have similar experiences? Thank you for a feedback.