VDU with problems??!!

Problems with DSG I just came from a little ride home and found out the following: I drive around in the D so comfortably (120 km/h), before a turn I switch down to the 3rd gear via the paddles. Starting curve is quite accelerated but the DSG no longer switches up. Stays stuck in the 3rd, on 6000 tours I then intervened myself. Is this normal?? I was of the opinion that it goes back to the D mode independently. Or am I somehow wrong??