My xenon in Phaeton flickers

Hello dear Leut, help….please . I have a V6 3,2 l Phaeton Built 12/2002 . I bought it about 4weeks ago from Private (guarantee exclusion ). Now I notice that the Xenon Flackers. Is it enough if I change the pears or what do you mean? I have also read here that it is a mistake from VW and could be changed to Kulanz. Do I have a chance? I would be very grateful for every INfo