Loss of power, won’t kick down. 2litre Elegance Estate

Hi everyone - 2 litre Octavia DSG 2013 estate.

Recently I’ve noticed that the car behaving a bit erratically, for the first 5 miles there’s plenty of power, the car accelerates well but after it’s warmed up the gearbox is reluctant to kick down and the engine just seems to rev but lacks power to the point that I cannot pull out to overtake on a dual carriageway.

The cars done 100k, bought it a few months ago and been delighted with it up till now, any suggestions would be very appreciated.