Automatic transmission switches uncleanly after transmission update

Good day dear Phaeton community, my father owns a VW Phaeton 3.0 TDI from 2009 and he recently has a following problem. If the car was standing for a few days and then wants to drive the car, the car remains in the first gear “steck” and in the onboard computer then the gears disappeared, as where normal D1 stands, there is nothing more. It also does not help if you switch in N or want to switch manually, you have to restart the engine. And what also happens after longer driving so 60 km and you i n the city is and stands at the traffic light and then wants to go he turns really high up to 2-3,000 turns and drives slowly, until the 3 gears he beats the gear in and got the 4 again normal. What could that be? A transmission oil change unfortunately did not make any remedy. KM Stand 260,000 never made problems, he had only got an update on the transmission from VW because of exhaust gas manipulation since it was noticeable. The car also stood a few days at VW but could the wrong Oddly enough, he doesn’t reproduce.